The performance of your system is not going to get much better by kicking the Pioneer out the door and replacing it with separates. The extra wattage available isn't enough to justify the expenditure. With two powered subs and efficient speakers the AVR isn't working very hard at all to provide the power to drive your 7.1 speakers. Remember that the heavy lifting of the low frequency stuff is being done by the subs amps which leaves the Pioneer lots of headroom to drive the other speakers to insane levels. You would be better served buying the Radioshack Sound meter and adjusting your room than going to separates, IMHO.