Research the Channel Island Audio D-200. It's a Class D amp similar to Nuforce and Bel Canto. There is a lot of information available about any of these amps. They are all light weight, cool running, and have a fairly small footprint. I auditioned the Nuforce - a great amp IMO - but settled on a pair of D-200's ... mostly due to financial considerations ($5,000 vs $2,500 new). I got a pair here on A-gon for about 60% of retail. The D-200's should work well in your configuration.