Thanks for the input. Here's a little more info that may be helpful. I'm thinking about getting a Denon 1613 or 1612 receiver and a pair of bookshelf speakers. The room we have now is quite small (~14 x ~14ft), but we rent and will most likely be moving in the next couple of years. In the future I'll be adding a center, sub, and rears (probably in that order. Possibly adding towers and moving the bookshelf speakers to rears). I'm looking to use these to listen to music from MP3 and streaming sources and watching TV and movies. Upon doing some more research, some of the speakers I'm considering are:
Polk Monitor 30, 35, 40, and 45
Polk RTI 4 and 6 Polk RTI A1 and A3 (over budget, but I read good reviews on stereophile and would love to get the newegg deal the above poster mentioned)
Boston Acoustics CS 26 II
Cambridge Soundworks Model 6
Infinity Primus p163
Pioneer SP BS22 (I know these have gotten great reviews, but FWIW I don't really care for the looks of the grills)
I'd like to get something that offers a matching center for my future expansion plans. As a reference point, I have some old Klipsch pro media 2.1 speakers hooked up to my computer now, which I think sounds pretty good, but the bass is a little muddy sounding to me (but that may because I had to put the sub in a corner so it's a little overbearing for the office).