From doing a quick google search I saw a fair amount of positive reviews of the Classe CAV 150. Is there any way you can audition it? Does it have a lot of hours on it? What gear are you going to use with it or the Emotiva XPA-5?
Emotiva does have the 30 day return policy on their products if you find you don't like the amp. Lots of XPA-5 owners are pretty happy with it though for HT. I own a UPA-7 and am very happy with it.