One amp for "everything" makes it challenging, I doubt if I had such a thing it would necessarily be anything all tube (or necessarily Ampeg but I do really like them), but for me "everything" means primarily A LOT of live gigging and jamming which means I'm always toting my amps around and leaving them my vehicles in all seasons and temps, basically not the lifestyle I would wish on any high dollar tube rig.
With that said I voted V4B.
Paired with a reasonable cab (2 12") or even a couple of single 15s it would cover a lot of ground and be as "big" or as "small" as I would need it.
Although I ALMOST voted B15.
I really like combos and it is practically one. However if so I would specify the B15R, even though many don't revere it as much as the true vintage ones (which is good for pricing purposes), it is a healthy 100 watts, has a DI, is capable of running an extension cab, and was one of the last B15's Jess Oliver personally had a hand in.
Edit: Ooops, I see you've already struck a deal, but anyway, enjoy your SVT and 212s. Oh, please post pics and let us know what you think of the cabs.