If you can score the Carver Crimson 275 for $2750 as advertised on Underwood's website, I'd do it in a minute. His 'homage' to the McIntosh MC275with the kind of original thinking and tweaks only Bob Carver can do, plus a very conservative design relative to tube life, that would be a no-brainer for me. At 75W/Ch it may be a bit more power than you would otherwise buy, but I would just consider it extra headroom.
My second choice would be an EL-34/6550 roughly 40W/Ch Amp. A restored vintage McIntosh MC240 would be great, but a more modern interpretation of that basic architecture would also work very well.
I would take a close look at the Prima Lun 200/300/400 models. They're kinda textbook examples of the most common approaches to the EL-34 design world: Triode and Ultralinear, plus tube options including the EL-34, KT-88, KT-120, and KT-150. I'd probably lean towards the KT-88, but that's just me.