I play alot of blues and classic rock and I use a Strat. Im wanting something all tube and a combo. I know Fenders are good bluesy amps, but Im looking for something around the 50 watt level. The only Fenders I can find that I like the sound of are Blues Jr.'s and 57 Twins. But I have about a $500-$650 price range. I dont mind buying used, so any suggestions.
im thinking something like a fender hot rod would suit you well, you can probably find one used too.

and musicians friend has a pretty good search function, thats how i find most of my stuff, even if it is just to drool over