A bit spendy to outfit when starting up with a new system, but the Canon EOS cameras are pretty good. I started with a Rebel GII kit, which was a decent body for the money but a rather inadequate lens. I switched from the cheap zoom to primes, which aren't really cheap, but quite worthwhile. I also went to the Elan 7N body, which has more features and is all the camera body I'll need for a long while, I think, and falls in the middle price bracket.
Don't overlook older cameras, though. I have an AE-1P also, and it's an excellent camera, although it needs some work... mirror bearings are starting to go, I believe. It does lack some features, but it works well and is cheap. And the lenses, which are the important part, are pretty cheap, as well, with excellent optical quality. If you can live without fancy electronic features, and need the best bang for the buck, these older cameras are your best bet. That also goes for other brands, I'd expect, although I've heard that Nikon lenses aren't quite as cheap as other brands due to the Nikon system's backward compatibility. I can't say much about that because I don't shoot Nikon and therefore haven't researched it.
Really, it all depends on your photographic needs and your budget.