For a music system in this price range, I'd recommend the Spica TC-60s that are being closed out on AudioAdvisor for $599.
For a combo system, from what you have on your list and considering what you'll be using to drive them, I'd go with the Paradigm Monitors. Musically the Quads are nicer, but they'll reveal the weakness(es) of your Pioneer receiver. They'd probably just frustrate you. Likewise, the B&Ws would sound shrill and edgy with your amplification.
Paradigm is a nice happy medium. BTW - Have you had a chance to listen to them yet? What did you think?