Inexpensive Audiophile Set-up?

Is this an oxymoron? Am I a moron ( just thought that I'd cut that one off at the pass). Here's the deal: I'd like something that sound pretty good, but I don't see myself spending more than $300 per piece in the near future. Maybe a bit more for speakers if they look really nice. I anticipate buying used stuff unless there's a compelling reason not to. So far I've purchased Adcom GFA-555 amp ($300) and PS Audio 4.6 pre-amp ($200). I think that my next purchase will be a cd player. I listen to mostly reggae,jam band recodings on cdr and radio. My current speakers are Boston Acoustics and Infinity bookshelves. One cd player within my budget is a Marantz 6000 OSE on Ebay. Thanks for your time.