This is way under your budget, but I've been very pleased with the LSA VT-70 from Underwood HiFi. 35 watts/ch with EL34 output tubes (and you can also use 6550 or KT88 tubes in the amp.) And, besides my good experience, it also has a number of very favorable professional reviews.
Compact ~20WPC Tube Amp
I should say 20WPC or more....
I’ve been trying to use a 8WPC 300B SET (Sun Audio) with some vintage bass reflex studio monitors from the 70s (96dB) and it’s clear that I need a bit more power. Everything sounds really awesome but the highs will distort at anything beyond low-medium volume which has been fine but I want to play a little louder sometimes!
Space is limited so I need a stereo amp or maybe small monos are possible.