i have the onkyo 803. the like the processing of the unit, but i feel the power can be improved on if i add a power amp. what will be a good power amp for the 803. also which speakers should be used with the 803 to suite for HT and music. i have checked out the warfedale evolution with the onkyo, which was good. is there any other speaker band that will be a good match for this unit. another question, since the onkyo 803 is THX certified do the speakers and sub need to be THX too. sorry of so many question. thankyou.