You might also consider McCormack, although I'm not sure if he's got a 3-channel amp out yet--check the website. They're very reliable so if you can you might want to check out some used McCormack amps. I bought a DNA-0.5 Rev. A for $1600 and they still seem to pop up every once and a while, but the 3-channel amps seem harder to come by on the used market. Steve McCormack has told me his current amps incorporate up to his Rev. B level of modifications, which makes them a relative bargain. Best of luck.
Tim
Tim