I need to replace my current receiver, as ive just replaced my speakers and they are far too good for my current system. The speakers are AE Esprits, and are they are really quiet, so I think I need more power. I currently have a entry level pioneer D510 (5x80w apparently) - which was great, but is just not good enough now. I will be listening to stereo sound most of the time, so it needs to do this very well. I will only be needing/using 5 channels very occasionally. I havent got a clue what to look at. I dont mind buying 2nd hand, if what Ill be getting will be much better than new. Any suggestions?