If you would like to try tubes, the jolida 102b is even a bargain new at $750.00. Used, you can find one for around 500ish. If you just want an amp, how about the Antique Sound Lab WAVE monos? Aren't they just $300 a pair? I know it's all relative, but, for me, the best "budget" amp I've heard is a Rogue 88. They go for about 750 here on the 'gon for the non-magnum version.
BUT, Unsound is right: if you have 86db speakers, tube gear'll be a little outta your range.
BUT, Unsound is right: if you have 86db speakers, tube gear'll be a little outta your range.