I went from Onkyo + Audyssey to the Pioneer SC-1222-K + MCACC. In my opinion both the Audyssey and MCACC are both good. The two minor things I don't really like is no subwoofer EQ and no 12v triggers,but it sounds awesome with both movies and music. Furthermore, the SC-1222-K is usually on sale for $530, which is an awesome deal. It has pre-outs for external amp as well. The iControlAV2012 app for iphone and ipad is really good too.
If you want to go Denon, I wouldn't go with the 1913. I would go with the 1713 which has Audyssey Muliq XT. If you combined it with the Phase 2 Pioneer speakers and a good sub you should have an excellent system. I went from a 7.1 to a 5.1 system, and it sounds much better. I've got front Polk Audio Monitor 70's, center Polk Audio 25c, surround Jamo S426 towers, and klipsch RW-12D sub for a total of:
Monitor 70's x 2 = $321
Monitor 25c x 1 = $150
Jamo S426 x 2 = $87 (on sale at Fry's Electronics
RW-12D x 1 = $321
S-1222-k x 1 = $530
Total = $1409.00
I went with the Polk Audios instead of the Pioneers because to me the Polk sounded better. It helped that they were on sale too. If they weren't on sale, I would of gone with the Pio's. The most important part of your surround sound is to at least match the front 3 speakers. The sub and surround can be different brand / model.
I'm currently looking to add another sub
The wife won't be happy about that lol.