Man how times have changed. 25 years ago I got my first Traynor tube head for $50 at a pawn shop and a Sovtek MIG100 for something like $150 at a guitar store. Now the same stuff goes for 8-10 times as much.
I'll say a Line 6 Flextone II. The "high gain tube amp" sounds aren't as convincing as new modelers, but there's enough power for most rehearsal/live situations, good sounds onboard, and a bunch of very useful effects.
edit - right on Larry