I'd like to know what is the best tube amp out there for under $150. I konow I'm going to hear ValveJunior, and I know it's good, but is there anything else? I play classic rock.

I just want to be sure I'm not missing anything

Used Palomino V8 or Fender Champ 600 are both worth a look. $150 for a valve amp is pushing it, though.
Under 150?
Go for something used.
Main gear (For complete list, see profile):
Epiphone Les Paul Standard Plain-top
Basswood Telecaster, 2 single-sized HB's, both split.
Epiphone Valve Junior
B-52 AT-412 Cabinet
Oh, and I have a Squier VM Jazz Bass too.
May recommend you to wait and save more money? With more money, you'll have a broader range of amps to choose. $150 for amps isn't very good, is it?
I think you could get a 5watt Blackheart, seriously great amp!!!
MIA Fender Strat
Yamaha FG-450S
Crafter 12 string
Orange Rocker 30 combo
Vox AC30CC2
Epi Valve Junior
Fulltone Clyde
Danelectro Free Speech
T.C. Electronic Vintage Dual Distortion
Boss MIJ GE-7 (c1987)
Boss TU2
MXR Phase 90
Artec delay