Hi I have a Denon 3805 with a set of Mission FS1 6.1's attached which are fine, but I think I'm having a few proplems with them. Is there a good replacment out there. Still need to be around the same size becuase of the room and silver or white are the only colours I could have. Budget of around £700? If i can get 7.1 out of the new set, great! Any ideas what I could go for? Would BOSE be a good option? thanks.