I wouldn't worry about the WPC rating. The Axiom speakers are relatively sensitive, and unless you're going to be driving to high levels, 65 WPC should be quite sufficient. Also, I think Outlaw is one of the few (like Harman/Kardon) that test all channels driving for their rating. In other words, some companies (I don't know if this includes Denon) test only one channel to get the WPC rating.

If you can afford the EP500, do it. Hands down.

I am the Doctor, and THIS... is my SPOON!