If it was me, I wouldn't go overkill. I'd rather throw that towards a nice display (and your current one could be for all I know . . .) and/or speaker/sub upgrades, or room treatments, etc.
If you've got an Outlaw amp, you obviously don't need to worry about beefy amps.
What will make these units sound the most different is actually the EQ/RC they employ. Onkyo will use Audyssey MultEQ XT, Pioneer will use MCAAC, Yammy will use YPAO, and I've no idea what the Emo will use.
Then you have VP: Onkyo will use Reon HQV + ISF controls, the Yammy will use Anchor Bay VRS, no idea on Pio or Emo.
I've only ever used XT for RC, but I'm a big fan. Some people love MCAAC in that it is much more tweakable than Audyssey, if not to the same level of resolution, perhaps. YPAO is the most basic of the three mentioned.
Both Reon and Anchor Bay are well respected VP brands.
do ya need all that? If you don't, you know even a $300-400 receiver might work . . .
I'm using a refurbed Onkyo 805 as pre/pro, and maybe my ONLY regret in skimping is not having Audyssey Pro capability (Denon 5308, AVP, NAD T175, Integra 9.8/9.9 . . .)