I have a pair of mid-level Koss I paid $40 for that sound really good. They cover the ear with rubber seal, and attenuate outside sound 10 db or so. With volume control mcmelectronics is selling some Koss for $30, PN 35-10240.
Earbuds won't stay in my ear.
I bought some mcm house brand earphones with the rubber seal, for $8 and they had too much bass and not enough treble.
I find the $2 lightweight mcm earphones with foam pads that don't attenuate external sound, to be pretty good sounding. I won't wear sound attenuating phones when out in traffic. The 6' cord is necessary in my opinion, 4' is too short.
BTW I test sound equipment with piano CD's or LP's, If it doesn't sound like the Steinway in my music room, speakers/phones are ****. Of course recordings made with Steinway grands have more bass than my 40" console, but the mid and treble should be similar. Headphones frequently pass (not the Radio Shack ones). No speaker comes close until I found a pair of Peavey SP2-XT for only $600.