I just picked up some nice Polk R50's for fairly cheap off of Outpost.com, and I am now looking to upgrade my cheap Pioneer SX-255R to something a bit nicer. After looking around on this site a bit, and on Ebay, I am thinking about purchasing a used Carver M500t power amp, and an Adcom GTP500 preamp/tuner (also used) to control the speakers. Folks reviewing the Carver amp on this site seem to hold it in pretty high regard, but is it better than a more modern option? I am pretty limited by price, and I would like to keep the amp under 300, cheaper is better. I would like at least 100wpc, and more is of course better. Any opinions on other options for the power amp are welcome. As far as a quality pre-amp, I am pretty much flying blind here, as I've never delved into separates before, so any advice on the quality of that Adcom unit, or any others from that company or others is also welcome. I'd like to keep the preamp price pretty low, probably under 170 used. I'm also considering a new (or used) cd player to upgrade my low end pioneer disc changer. The Adcom players seem to fit the bill again, both price and performance wise, assuming I purchase a used one. Once again any suggestions for a 150 dollars-ish cd player is also welcome. I'm perfectly willing to purchase used things on Ebay, and I am in fact counting on those cheap prices to help me get some stuff that is worth the upgrade. Thanks for any help.