Sunfire's do run very cool. I live in th UK, however, and Sunfire puts modified speaker connectors on their european units which only allow bare wire or pin connections. Apparently for safety reasons but hard to understand since as far as know virtually every other brand sells amplifiers with at least spade connectors. Were it not for this, I think Sunfire would be the answer.

Another alternative I'm thinking about is Rotel RMB-1077, which is class D and has gotten very good reviews. The biggest negative is it only has RCA connections and my G68 has balanced connectors so I'ld need to get new XLR to RCA interconnects.