Well, if you want to have a company put it together, scratch the low prices. However, if you are willing to build it yourself, then you can buy any computer part you would ever need at www.newegg.com
don't forget www.monarchcomputers.com They're good people from what I hear. Seriously, if you're intersted, this is the place to learn about building a computer. It's much easier than you'd think, and then all your friends think you're way smarter than them because you put a computer together.
you wont find a PCI version of a 6600GT, it doesn't exist.
I'd be highly surprised if there was one, but yeah, wouldn't count on it.
As far as PCI is concerned you wont find a card thats anywhere near as good as that one...not only is PCI crappy for graphics cards, but they aren't really up to date compared to AGP and now PCI-E
Strange, when I was shopping for my setup EVERYONE told me to avoid AGP at all costs. What's the deal? I mean I have a PCI graphics card and the graphics are nothing short of phenominal compared to before. Care to shed some light? btw, what is PCI-E?
Oh wait, maybe I'm an idiot. Does PCI-E stand for PCI Express? LOL, if it does I apologize, because I have this card: I assume that's a PCI-E?