McCormack DNA 500 vs DNA 225 upgraded

I am looking for some feedback on comparing the stock DNA500 to a DNA225 upgraded by Steve McCormack. There were a few posts that only touched that subject. I am thinking about adding one of those amps to my system and relegating the HT5 to the surrrounds and center.

The DNA500 has amazing reviews, as the DNA225 upgraded also does. Is there a benefit to either one? I notice at this point there are no upgrades available on the SMC site for the 500. I imagine the cost for either is similar.

Thanks again for any help. This forum has been outstanding for me to learn from.