Start with one of these:
Sherwood RXV-4105. I know three friends with these (I recommended them
) and while they won't impress audiosnobs, for their purpose, they provide great service and sound.
That leaves about $400 for s set of speakers, and perhaps a CD player should you choose to not use your computer.
As for Cd players, if you don't mind a guaranteed refurbished changer from a reputable dealer, for $80, [url="http://www.accessories4less.com/make-a-store/item/DENDCM290/DENON-DCM-290-CD/CD-R/RW-5-Disc-Changer/1.html]
THIS[/url] is available as are others at that site. You might want to check it out. Personally, I went for a refurbished Marantz changer a few years ago from them. It's still working fine.
So, there's two quite decent, guaranteed units for about $180, leaving about $300 for speakers. Your move...