Other than being different (Yamaha sound vs Onkyo sound), there will be no benefit in changing to the 1010. You'll also probably find that the 1010 may not quite have the drive that the 905 had. Ideally, you'd have to be looking at the outgoing 3009, or the newer Onkyo TXNR1010 that replaces it. You may find that the older 1009 may be more refined, but you'll be losing out on power ability.