I'm looking to replace my Denon 3311CI Receiver with a strong power amp and pre/pro separate. I'm open to purchasing an older and less expensive model amplifier to save money, and either a new receiver with pre outs or new pre/pro separate. I would like recommendations on the best price performing amp to meet my needs. My room is 33x23x9.5. My speakers are definitive technology bp7004 main, clr2002 center, (2) velodyne hgs15 subs, and b&w dm602 surrounds.