Hi all, I'm thinking of upgrading my Yamaha RX-V657 amp over the coming months and think i've got it down to one of two. The Yamaha RX-V465 and the Onkyo TX-SR507. What are people opinions on these two any pro's & con's on them etc??? On pure looks i think i prefer the Yamaha but i'm more interested on performance etc. Cheers Dave.