A $250 tube amp ends up costing more, perhaps about $500... because once you have tubes, then you will want to try various ones to see what fits your tastes. Generally, the current production tubes that are used in tube amps suck, but amp makers have no choice, because they there is no quantity source of reliable 50 year old tubes.
So, the fact that the Vali has soldered tubes makes it an especially good value.
I just got my Mad Dogs upgraded to the Pro version and am really enjoying the improved sound. It's a very worthwhile upgrade! I've been powering them with a Magni but have been interested trying a tube-based amp. If I make the change to tubes I'd use the Magni in the office.
My budget is probably $250 or less so I don't know what the real options are, outside of the Schiit Vali (which seems like a good match and a great value at $120). I'm interested in any suggested amps to consider in addition to the Vali.