you can get an hk 3600 or 3700 for under $300 on ebay. it powers my 5.0 just fine. i haven't gone past -25 on volume. i watched tron legacy and my ears were ringing afterwards.
Sharp LC-60LE632U
HK AVR 3600
Def Tech BP 2004 TL
Def Tech CLR 2002
Def Tech BP2X
AudioSource SW Fifteen
room size 15d 17w 10h