Widescreen Review gave Arcam's AV-300 HT processor an
mooic review. They said it was the best sounding AV receiver ever and beat out separates, YMMV.
That said, I agree with the others that you need better speakers. It really pays to focus your money on the front stereo loudspeakers and sub. The center and surrounds should be secondary in your decision making (matching all your speakers is overrated, most of the HT and music is produced by the front channels).
I personally have Vandersteen 1c's and they're great for both music and home theater (many regard them as the best speaker deal under $1000). Don't know about their availablity in your region though.
Do you have a budget?