top candidates in my view (used, 2k or near abouts, or under)
dena pontus (as mentioned) - well balanced presentation, nice resolution, big soundstage, warm mids and bass, slight ss grain
soekris 1541/2541 - very similar to pontus, a bit more forward treble, slightly smoother mids, useful variable output
doge 7 - great smoothness and effortlessness, nice warmth, slightly tubey character, slightly softer bass, useful variable output
audio mirror tubadour - touch warmer than doge, further touch slower, more romantic, bloomy bass, slight treble grain
mhdt orchid/stockholm/istanbul - rich flowing smooth sound natural detail (sound varies with tube used in buffer stage), modded versions add outstanding bass impact
chord qutest - other side of spectrum - clean crystal clear sound, terrific soundstage, fast and lean, but minimal ss grain
schiit yggy - similar to pontus/doge but more forward treble, touch of grain/sibilance
hope that helps