Classe compared to the Theta Dreadnaught

I am not an audiophile and putting my first real HT system together. I understand that you usually can not compare a $4000 amp to a $6500 amp. How much better is the Dreadnaught? I have not been able to compare them but hope to do so. I have limited funds so spending an additional $1400 dollars to buy a used Dreadnut vs a Classe is an important decision. Thanks
P.S. For what its worth, based on speaking with Classe the CAV-180 is not really comparable to the CAV- 150. Thanks.