illoyd21:i have moved from the old 875 to the arcam avr 600. I have the fat ps3 and recently swapped it out for the popcorn hour c200 for dvd and bluray. The difference between the 875 and the arcam is truly unbelievable. onkyo has been sitting in my ebay pile ready to go, and tbh would hate to go back. Movies and Music are on a different level. i tried the avr500 ~2k and this is very close aswell imo, so maybe worth considering if you are looking in this price bracket.
Yes, the Arcams are great, but would be wasted on the OP's speakers - which though great, are only £1000 style speakers. The Onkyo is more than enough to drive them well.