If you are interested in other options, you might also consider Parasound JC-1s (disclaimer: I sell them). A customer who recently borrowed a pair from me to try with his MG 20.1s declared them the ones to beat, having tried quite a few other solid state amplifiers, some costing well into five figures. At some point he may biamp his speakers, which wouldn't be cost prohibitive to do with JC-1s. If you're committed to tubes, I agree with Duke's recommendation of the Wolcotts. Either way, you'll be a happy camper.
Brian
Brian