Hmmm, this could prove to be challenging. Unfortunately, by the time any of these mics record something and it gets converted to an mp3 you may not be able to tell much difference. I can probably help out with the B1 and C1, though it's going to take some time.
Ideally, if you really want to compare these, you'll need to record a piece while using all mics simultaneously through identical sources to identical recording media. You'd also need to make sure that the microphones are placed in their optimal positions.
Let me offer a few thoughts on these options overall though. If you have the money, buy yourself a matched pair of the C414s. The C414 is a phenomenal mic and it is very versatile. They'll set you back a few clams though, i.e. a matched pair's gonna run about $2,000.
Studio Projects B1 and C1. They have similar sonic characteristics overall except that the C1 has a bump in the higher frequencies. This bump makes the mic sound a little more "airy" and "open" as compared to the B1. The B1 has a slightly "darker" and "warmer" sound. The B1 costs $99 and the C1 is $199. You could get a pair of each of these and spend less than $600, and have flexibility. These are some of the best budget mics I have ever used.
I personally like the sound of the Studio Projects better than the Rode NT5s. May just come down to personal preference though. The NT5s, to me, are bright without having any personality. They sound sterile to me. Some people love them though. I generally tend to favor a warmer, darker tone.
Additionally, depending on what type of recording you want to do of your piano, you may want to look into boundary mics (also known as Pressure Zone Mics, or PZMs). Audio Technica, Audix, Crown, and Shure all make some. I have heard recordings of pianos using these mics that are phenomenal. These mics work well inside the closed lid of a grand piano and give the piano a very "intimate" feel. I've seen them used a lot in ensemble type playing or in jazz recordings where the recording engineer didn't want the rest of the band bleeding through into the piano mics. These range in price from about $80 - 300 a piece.
I do not have any experience with the Audio Technica 3035, or any of the Apex mics so I can't really offer you any insight on those.
My own personal philosophy with microphones is to buy mics that I will continue to use regardless of what other mics I might buy; it's all about colors and flavors so to speak. I have a particular fondness for good sounding, cheap micrphones. Thus I own and use Studio Projects mics frequently. I also have a fondness for snobby, recording studio quality mics too. That's why I also regularly use a Brauner Phantom. The B1s and C1s gets used more often though.
The next piece of gear in line from your mic will be a mic pre. My advice would be to spend more money on this than on a mic. A pair of B1s running through a Great River MP-2, at a combined cost of $2,350, sounds better than a pair of Brauners running through a pair of Studio Projects VTB1s, at a combined cost of $3,350!
The list goes on and on. Let me know what else I can help with. (assuming any of this has helped!)
Jef