I was playing through an Ampeg VT-22 for years.6x12 fits fine in my compact sedan, if thats whats got you worried.... And by compact, I mean several inches shorter than a Corolla.
Are 2x12s out by default for whatever reason? Lotsa goodies there
Gotta call Hot Rod Deluxe here....
Althought the aforementioned Blackstar's are pretty awesome.
No love for your Marshall VS100?
Mesa 5:50... 1x12, light as anything and with the contour knob you can get some serious half stack power/chunk
Takes dirt pedals like a champ too!
Peavey Classic 30.