I have recently become a huge fan of this company.
http://www.hometheatertalk.com/ubb/Forum10/HTML/
Read this thread and then consider that the new AVA 220watt Fet-valve 550EXR is FAR better.
This amp has the transparency, authority, inner detail, dynamics, control, extension; flat from DC to 500k, pitch-perfect tonality, and a delicacy on par with 10K + amps. Unless you can't live without a big name on your rack, you'll not want to live with anything less. Au'natural. Absolutely vanishes...paid advertisement, not