I got my 90w mesa black shadow blown with my 50w zambelli amp after only a couple hours of live playing
the speaker died in the third band
the amp was loud for such a small bar room, but that means output volume around 1, and preamp around 3-6 tops, which is not THAT loud
I had a 100w framus cobra with the matching 100w cab with greenbacks, but I think a bunch of speakers are safer than a lone 1x12 speaker, despite of the power rating
I'm not sure I'd pick a 50w 2x12 cab, although I never had a problem with the framus cab
unless you have something against v30's, nothing can beat the price of the harley benton 2x12 sold by thomann
if you're decided on the greenback tone, you could buy an empty cabinet and order some higher powered webers , like silver bells
I have a pair of scumback h75's, which are g12h clones made by weber
they sound pretty close to a production celestion, but are kinda thicker sounding with a slightly smoother top
got these used for quite cheap, but if I had the cash, I'd order M75's, which are the greenback clones