Those speakers are extremely efficient and can be driven by any decent receiver from Denon, Onkyo, Yamaha, etc. Almost all of them will provide at least 80W per channel with 2 channels driven which is more than enough for your speakers. The bigger issue is your desire for room filling deep sound. As someone who own the RB61s I can tell you that you will not get a lot of bass from those speakers. It is the nature of bookshelf speakers. You are probably going to want to get a subwoofer to help with the low end frequencies. A couple of ideas include a BIC F12, Polk Audio PSW505, and a Klipsch RW12D with the Klipsch sub being the best of those choices. Hope this helps.