I would go with the 350.8 over the 350.8. Why do you want to replace the Electrocompaniet?
Now you have a different user name?
What kind of "new sound" are you trying to get? The AW180s are actually great amps with excellent control and nice detail without being too bright.
That being said, you should go with the Pass amp that sounds best to you. That would be a bigger factor than power output based on the size of your listening room.