cheap and still decent
solid state : Vox Pathfinder 15, with built-in tremolo and reverb, the gain channel is useless though (sound like bees in a tin can)
tubes : Epiphone Valve jr., a Fender Champ or a Blackheart Little Giant
not too expensive and great value for money are
solid state : LabSeries L5
tubes : Peavey Classic 30 or Fender Blues jr.
a bit more expensive and really nice
Vox AC15
Fender Princeton or Fender Deluxe Reverb (even the reissues) as alredy suggested, I'd like to add the Fender Vibrolux Reverb and the Fender Tremolux
Ampeg Reverberocket
Trace Elliot Velocette (no longer made, same as Gibson Goldtone)
if money is not an issue, you could go bouteek, Victoria makes great amps
or you could just go amp hunting and find a nice vintage amp, doesn't have to be that expensive but will always give trouble at some point (and a good amp techs are hard to find as well)
I think every player should have at least a couple of amps, the choice is endless, you really need to try out as many as you can and eventually, you'll find the amp that suits you best, it will be an amp that you will never sell
I settled for :
a small tube combo for home/studio/small gigs (I have a custom made small head that I use with a 1*12, 2*12 or 4*12 cabs)
a small solid state cheapo for practice, something that is reliable and I don't have to worry about if I leave it in my car during cold winternights ...
and a workhorse, an allround tube amp, I settled for a Mesa Boogie Mark I (that's the one I'll never sell, been with me for over 20 years and never let me down), still I have a Fender Twin as a backup (another classic, just too heavy to carry around)
and a couple of vintage amps, there are some real gems out there, Fenders, Supros, Silvertones, ...
I simply couldn't resist some of the bargains that I stumbled upon (a nice old 60's Farfisa a 1952 Dynacord and a 1967 Dynacord)
I never liked the modern modelling amps (Line6) or amps with built-in FX (Roland Cubes)