Just a bit on the merits of Class D, our system at HE 2007 was given great marks by a number of reviewers and by many people who attended the show! See Stereotimes show review.
Our entire reference system cost what many rooms were using just for the electronics!
We were using the latest Nuforce Ref 9SE V2 to drive the Usher BE 10 loudspeakers.
The sound was crystal clear with excellent bass control and a clear well defined sound stage. The system was well balanced with wonderful low level detail.
All in all the system rocked and the Nuforce Ref 9 amps with the new P9 preamp cost $8,150.00 combined.
Class D is controversial and many people still prefer the warmth and presence you get in linear amplifiers, but the writing is on the wall look how many companies have moved into class D: Rowland, Bel Canto, Kharma, ARC, Rotel and their are many more.
Class A linear amplifers do have some wonderful attributes but with energy prices skyrocketing and Class D being so practical it seems that Class D is here to stay.