Planning on picking up a new home theater package consisting of the RF-82 II fronts, the RC-62 II center and probably the RS-52 II surrounds. I'm currently running an older Marantz SR5000 at 70w per channel with my current B&W bookshelf theater. I was wondering if I needed to upgrade my receiver to run the new speaks. If so, how much power do I need to look for and are there any recommendations? I'm not looking to spend a great deal of money on a new receiver if I can avoid it.