bpape's advice is good. Paradigm has a great selection of speakers over a wide range of prices. Going back to dloweman's recommendation, another idea is to "build" your system slowly. You could buy the Studio 20's for around $700 or so (with a dealer discount of around 12%, not uncommon). Then, when you've saved up a little more money, say $575, buy the matching CC-470 center channel speaker. Then, when you've saved up another $700 or so, buy another pair of Studio 20's for your rears. Then a sub. Or you could get the sub before the rears, either way.
A lot of people build their systems this way. It takes longer, but in the end, you end up with one kick-butt system. By the way, I have the Studio 20's. They are, in my opinion, one of the best speakers, for the money, that you can buy. Wonderful sounding!