I have been interested in the new wave of Class D amps myself. About 3 months ago I acquired a pair of new Class D mono blocks made by Gilmore Audio, called the Raptor. These amps are very musical, and perform well across the frequency spectrum. Nice clear extended highs, and bass slam, like you expect from a good solid state amp. The real benefit to my ear, however, is that they also bring in a geat deal of the musicality of tubes, creating just a beautiful presentation. I haven't heard the new BelCantos, or the PS Audio. But I find these Raptor monos are the best solid state amps I have owned, period. For example, I used the Parasound JC-1's in my system for over a year, with the same Avalon Eidolon speakers I am using today with the Raptor. The Raptor blows away the JC-1's in my opinion.
I think Class D amps hold great promise, and the technology seems to have improved substantially with this new wave of amps. I encourage you to check out the Raptors as well if you consider Class D. Good luck.