According to some site "how to buy a piano" uprights are pre WWII are usually 44-48" tall and weight >400 lb.
They called post war pianos of 36-40" height consoles, and 44" studio pianos. These weigh 300 lb or less.
If you play fast at all you don't want one shorter than 39" with the drop action.
I detest the sound of Yamaha studio piano my church dropped $$$$ on. I won't even sing with it. It so soft needs a **** Yamaha sound system to be heard in a 300 seat auditorium. The bass notes are dull and lifeless. Piece of ****. I think they bought it because the salesman has beautiful blue eyes. Several satisfied custormers have told me about him.
I prefer a bright loud Baldwin Acrosonic from the fifties or sixties, 40" height.I play an Acrosonic some Saturdays at the "free dinner" in downtown Jeff, in a 200 seat fellowship hall, and it has no trouble being heard without electronics. In 1982 at a store in KC, I tried an Everett studio, owned by Yamaha at the time, against a Sohmer 39 console and a Steinway studio. The Sohmer had the best sound IMHO. The Steinway had a heavy action like a grand, which is good for practice if you are going to perform on grands, but is too heavy for my light bone structure. The Everett and Steinway had dull monophonic bass. The Sohmer has beat frequency bass, which in this size sounds better to me. All three were fast enough and had consistent soft action.
I found a 1941 Steinway 40 console on craigslist in 2010 and I believe the Sohmer was copied from that. It is very fast, has better bass than the 82 Steinway 44, and holds pitch longer than the Sohmer 39. I'm keeping them both in case I find someone to play duos with, (not very likely in this town without paying a pro). BTW the 1941 Steinway hadn't been tuned since 1966 and sounded awful, which is how I got it instead of the other seven lookers. It also had a lot of child toy damage to the veneer. I took seven tunings to get the Steinway to pitch, which it held nicely for four years.
Other quality fifties sixties seventies early eighties pianos are Wurlitzer, Sohmer, Hamilton by Baldwin, Mason & Hamlin, Chickering, possibly Kohler and Campbell. Prewar add Knabe and a bunch of other brands, they were built from kits back then. Don't try a former player piano, all the ones I have tried sound like ****. You can tell by the little door in the front for the rolls. When an upright shows up at Salvation Army, I try them. Some pass my speed test, some sound good, but the ones that cost more are the ones with decorations on the front. Prewar Uprights are hard to move and are frequently missing ivory pieces, which can be replaced with plastic and glue. Look to see how many dampers are missing, the cheaper ones are missing an octave and a half.
Of the above, the Wurlitzer studio at one church is loud and mellow without much attack. Baldwin Acrosonics are loud and have a distinct attack ping, which I like. Baldwin Hamiltons are fast and consistent enough, softer than the Acrosonics, and mellower if you like that tone. The Sohmer 39 has more ping than the Wurlitzer or any Hamilton I've played (several). I triedd a Mason & Hamlin spinet (36) at Goodwill I really liked the sound of, but a 36 is too slow for my repretoire. Some store brands are okay, some are junk, if you have time to go out and inspect one it could be a real bargain. I've played a "Goodall" studio at a nursing home that was really nice, but I think that was a store brand as I've never seen a listing for another one.
After the mid eighties, all these brands had their factories closed except Sohmer and Steinway, and the names were sold off to megacorperations that use them to import **** from the orient. I played a Wurlitzer from the nineties last year, the notes could not hit consistently when you played softly.
Brands to avoid are Winter, and the Kimballs made in my county did not hold up to use in US Army clubs, they were always torn up. Both these get a premium here on craigslist, that must have been some salesman. My high school friend that is a physician bought new a "superior" Pearl River studio in 2009 right before I bought the 1941 Steinway. He's replaced three strings in one location, the dealer won't come out on warrenty anymore because he lives 40 miles from Houston, and he doesn't play it. I'm putting an hour on the 1941 Steinway every night. The Steinway has one spliced string in the 3 string area, but it sounds okay if slightly different.
When looking on craigslist, check every note for sticking, but notes that don't repeat due to a broken leather strap can be repaired in 1 minute with polyester shirt fabric. Play one note as fast as you can with two hands to see how fast the action is. Look at the back for a cracked soundboard. Look inside for hammers scooped in the middle by too many hours (most used Steinways have this problem) hammer shafts bent, cracked iron frame, mouse eaten hammers or dampers. Play as softly as possible to see if it is consistent, and as loud as possible to check for worn pins that double strike. Look for broken strings, but don't worry a lot about a splice. For $200-300 don't worry about the pedals not lifting the dampers or dropping the hammers for soft, the movers often mess up the rods and they can be replaced by all-thread. Even a broken pedal can be replaced by a metal bar without much work, although i've never had to do it yet. I do have a vise to saw off the steel stock, drill the hole, and a body grinder to grind the end from square to piano shape.
There is a nice upright at Salvation Army now that has three missing hammer shafts, ***? I'm looking for a tinkly prewar upright for my country trailer, to play ragtime and JoAnn Castle/Frankie Carle arrangements on. A prewar Steinway upright with good hammers went here for $300, but the dealer got it before I did.
So have fun. Find a source of truck and helper before the used piano, the best craigslist deals have to be moved out before the house sells or the carpet man comes, and usually are horribly out of tune. You have to move fast. Harbor Freight dollys the wheels won't roll, but the rental dolly from U-haul seems to be okay. New Haven Moving Equipment rubber pad dollies are the best, but they moved to the exurbs, so I bought a 1200 lb rubber pad dolly from mcmaster.com with 5" wheels that rolls very well. I'm tuning myself with a tuning fork, two rolls of nickels , a quarter drive socket and a matching long arm allen wrench. but my wrists are getting arthritis, I'm thinking of buying an actual long arm tuning wrench this month. The top octave, you need an ear reference to get over the out of tune harmonics, I use a Hammond H100 organ.