My dealer friend recommends Digital Amplifier Company if going with Class D. IHO, it's best Class D amp on the market ... best Spectron, Rowland ... You can bridge 2 amps so it has enough power to drive any speaker.
It mates well with tube preamps. In auditions, customers keep asking where is the SET amp and couldn't believe it's a Class D amp.
Digital Amplifier Company only sells direct with a 30 days return policy and he gets no commission so just a strong recommendation.
http://www.digitalamp.com/