I just purchased a Denon 3802 and will be purchasing Klipsch Reference series speakers (RF-3II models all around) and an SVS (20-39PC+) sub soon. I would like to know what is necessary to bring my system up to full 7.1. The Denon lists support for 7 channels, so is an extra amp necessary? If so, which would be a good one to consider? If I were to go to a 7.1 setup I'd only have about 400 to spend on both the extra rears and amp (cheap price on Denon and slightly different speaker config, gave me a bit extra spending money). Also, in terms of the extra rears, should I go with the same primary klipsch rears and get 4 of them (RS-3II) or go with 2 RS-3IIs and 2 RB-3 bookshelf speakers (which would actually cost a bit more)? Thanks for the help!