Maybe a Traynor? Like the YCV50 Blue. Great sounding, 50w, 1-12" Celestion, you might need an ext. cab w/ it.
Or the Traynor YCV80, can be had in 2x12 or 4x10 configuration, a little differently voiced than the blue, but still a good sound.
I own the YCV40WR Anniversary 1x12 combo and a friend of mine owns the YCV80 2x12 combo. We both like them.
If you get the chance, you might want to play one, Trem. Traynors get a nice round, clear, chimey clean sound, and the OD sounds really good IMHO.
I like to set the OD just barely breaking up, and then use the "boost" on the footswitch to really cut through (it's a loud boost).
I don't know how loud you need clean for live playing. Most agree that the blue 50 watter has the best "British" sound, the 40 watter breaks up nice when cranked, and the 80 watter gets really frickin' loud and stays clean.
I think you can buy any of them for under $800, and they're made in Canada and have a solid reputation AFAIK. I've owned mine 5 yrs. and did nothing except change tubes, cause I like JJTeslas.
I'd say play one if you get the chance,tho, because I don't know if the feedback would go away. I've got one strat copy that always feeds back at high volumes through any amp, when none of the others do. I blame it on micrphonic PU's. I can hear the trem springs vibrating through any amp I run it through when I shake or bump it.
Guitars
Wilburn Versatare, '52 FrankenTele(Fender licensed parts), Fender USA Roadhouse Strat, Fender USA Standard B-bender Telecaster, Agile AL 3000 w/ WCR pickups, Ibanez MIJ V300 Acoustic, Squier Precision Bass,
Amps
Ceriatone Overtone Special, Musicman 212 Sixty-Five, Fender Blues Jr., Peavey Classic 30, Fender Super Reverb, Traynor YCV-40 WR Anniversary w/ matching 1x12 ext. cab, Epiphone SoCal 50w head w/ matching 4x12 cab (Lady Luck speakers), Avatar 2x12 semi-open back cab w/ Celestion speakers
Pedals
Digitech Bad Monkey, Digitech Jamman, DVM's ZYS, Goodrich volume pedal