Nad M33 or something better

Hello all,

I have a pair of KEF Reference 3 (non meta) purchased 2 years ago along with NAD M33 to power them. I was wondering if anyone has any thoughts on any other power for these speakers. I like the M33 but I think the Kef Ref 3 might be better with a better amp or integrated amp.

Any help would be appreciated. I purchased the speakers without hearing them with the NAD so I know that was not a great idea. The NAD powers them fine but everything I read about the Ref 3 is they need a quality power amp or integrated amp.

Thanks in advance for your help.