what used speakers to buy for 650?

I'm in the market for a used pair of speakers and have a budget of around $650. I just recently sold my Totem 1's, and the rest of my system consists of a Chiro C-200 amp, Sonic Frontiers SFL-1, and an Ultech UCD-100 cd player. I listen almost exclusively to acoustic jazz and have been seriously thinking of getting the Magnepan 10.1's. However, people are saying that I would need a subwoofer for this. So, that's it for the maggies. I would like to go back to "full" range speakers, or at least a floorstander. Any recommendations out there?????