My guess is that the biggest advantage would be the recent improvements to DSP, provided you like that idea. Audyssey xt32 is pretty amazing, but the digital room EQ approach is not for everyone. If you actually use these features, then my Onkyo 5508 pre-pro might appeal to you. If not, my guess is that the "unprocessed" performance of the Onkyo (or it's near identical cousin, the Integra 80.2),would not diifer much from your present system. However, that last part is stricty a guess.
Marty
Marty