Couple of thoughts...
Instead of SET, go with OTL amp from Atma-Sphere. On the right speakers (which I believe these will be), the Atma-Sphere sound is magically! To my ears, it has all the positive attributes one associates with SET, but is more robust at the extremes (especially the bass) and produces a more open and fast sound. A pair of used M-60's would be more than enough power and will keep you under your 3k budget.
If you really have your heart set on going SET, I am playing with a modified (i.e. upgraded) pair of Audio Mirror 45 watt/channel amps that use the 6C33C output tubes. While they are still breaking in, I think they have some excellent potential (although I don't believe they will best the Atma-Sphere amps). Here is their webpage: http://www.audiomirror.com/amps.html
George