Ok so I have some RF-5 and might be going to some 7's or some martin logans, I've got a discount because of the place i work at, what kind of amp would you recommend I can get krell and monster at a discount, and do i need to get a 6.1 or 7.1 amp or can i just have my amp run my front two and maybe center with a 3 channel amp and have my harman kardon receiver power my surrounds