I am looking for a pre/pro and amp to replace my Marantz sr8000 av receiver. I have polk LSI 15's maians, LSIC center, and LSI Fx surrounds. My sub is a Def tech super cube Reference. i listen to movies and music 50/50. I need a pre/pro and amp that will go well with my system. HELP!!!!!!!!!

P.S. Budget is $5-6k