Replacing Onkyo TX-SR605

Hello All

Iam looking tro replace my Onkyo TX-SR605.I have seen the following but cannot make up my mind;

1. Onkyo tx-sr876 with 3 years warranty

2. PIONEER VSX-LX70

there are other amps out there like onkyo TX-805 & 806 BUT HAVE READ ISSUES WITH 806

Will i see any difference with the above or do i go for the new Onkyo 609.I am not interested in networking etc just the best sound out of the speakers.The speakers i are using are all Mission,centre is a M7c2,fronts are Mission M73 tallboys,rears are Mission M70.

Which amps are best matched to the speakers?

Budget for the amp is around £450-£600

MY kit : Panasonic 50" g10,Pioneer BDP-51FD BLUE RAY,Denon 1930 DVD,sky hd,xbox