Speakers that can be placed against the wall?

I have finally decided to do something I promised myself I would do when I got out of college (just took about 20 years to make it a priority)...Get an upper-end stereo system. My problem is I live in a small house and need to be able to place the speakers against the wall. The room is about 18' x 13' with the speakers located against the long (18') wall. I will be able to keep the speakers away from the side walls but they need to stay close to the back wall. I like Jazz, don't usually listen at loud volumes, but would like to have a speaker that will sound good with most types of music (not asking much, am I?). I don't want to spend more than about $4-5K for the speakers (I'll probably buy used). This is the first component I want to buy for my system. I'm probably going to use a tube preamp and solid state amp (or monoblock amps). Any recommendations for speakers that can be placed against the rear wall, in a smallish room that can give good soundstage and imaging? Or should I take up knitting?