Well, if you don't need a sub then you can just move up the line with the paradigms... The best thing is, is that all the speakers are matching timbres, so you can mix and match and it'll all work. Get the best you can afford, you'll always be happier.

I can recommend a Denon AVR-3806 as a receiver, it falls right in your budget and has gotten some rave reviews. I really love denon and use a DRA-825RA as a stereo amp right now.

Check it out.