+1 for Aric Audio
Give Aric Kimball a call, he's a great call even if you don't buy his equipment. He offers 2 different 300B amps, a 2A3 amp, an EL34 "Push Pull" amp, a KT88 "Single Ended", and a pair of KT monoblocks. I own his Motherlode XL preamp, and the EL34 "Push Pull", and they are ridiculously good with high end components.
Ralphs (Atmasphere) tube amps get great reviews (though I've not heard them), and would be a great option for OTL amps. He even suggested that you look at the below Raven monoblocks.....tells me a lot about his honesty.
The Don Sachs/Lynn Olson Raven monoblocks that Ralph suggested, are Don and Lynn's end game amps.....though end game costs $10,000 for each monoblock