I'll second the McCormack DNA-0.5 or DNA-1. Very open, quiet, transparent, and smooth but with great detail and wide/deep soundstage. In fact, lots of tube lovers have praised McCormack amps. Another plus is you can save your pennies and have them upgraded by Steve McCormack(SMcaudio) into what many call some of the best amps available at any price. I've been using a DNA-0.5 Rev. A for a couple years and haven't come close to even thinking about upgrading. Steve is also great to deal with--very honest and straightforward. Best of luck.
Tim
Tim