The obvious answer is, whichever ones you like the sound of the best.
Seeing as you say bid, I'm going to assume that you will be buying them blind, so to speak. In that case, it might be easier for people to give an informed opinion if you let the forum know what equipment you plan to partner it with, size of the room, the type(s) of music you listen to and what kind of sound you like (neutral, open, revealing, accurate; coloured, warm and cuddly, etc.).