I think that a David Berning Siegfried 300B Single-Ended ZOTL is an excellent SET amp with the advantages of OTL sonics and terrific impedance matching without an output transformer.
They can be bought for under your stated budget, and would be one of the best amps possible at that price range.
They can be bought for under your stated budget, and would be one of the best amps possible at that price range.