I'll offer two comments:
I've never actually heard the Acurus amp you have, but it was on my list of amps when I was looking for a 3 channel amp. Actually it was at the top of my list until a super Rotel deal came along.
The only way to compare the sound quality is to do just that...get the Outlaw and compare. If it's not worth the difference in price to you, send it back. That's what the 30 day trial is for. However, I personally think that the balanced inputs of the Outlaw are worth it. But on the other hand, the Acurus is no slouch..but you can sell it for a good price on Ebay.
As far as speakers...I say Paradigm all the way. I never was a fan of DefTech, the bi-polar thing just rubs me the wrong way. I like a solid sounstage instead of that 'sound from everywhere' that I heard with DefTech. But again, it may be your thing. I just don't think you can go wrong with Paradigm. It will be years until you will get the itch for something else.