We really need a budget for any good suggestions.

I would suggest a sub for the bass you are talking about.

Regarding speakers I would recommend the Paradigm Mini-Monitors, reasonable at $400 per pair or so depending where you live. Another alternative are the Paradigm Titans, around $225 or so per pair. Both are great sounding speakers and decently priced.

A decent sub will cost around $400 or so and will complement the speakers quitel nicely.

I have the RX-V659 which is basically the same as your receiver and my Titans sound great but I want to upgrade to the Mini's because they do sound better.