I found a pair of JBL L20T speakers in great condition for around $120. I'm also considering a new pair of CSW Model 6 ($150). It seems that they'd both be pretty good performers at that price range.
I'll be using them with an Onkyo SR576 receiver and no sub, mainly for music (and some movies)--Rock, Jazz, Electronic--in a room that's about 20ft by 15ft.
Any advice would be greatly appreciated!