If I had to choose one amp based on suitability, availability, and bang for the buck, I'd suggest the 200s or any of its cousins (Sorado/Sonaro), though you may find them a bit underpowered for some live situations.
Model T's are an obvious choice if for no other reason than their higher power relative to most other Sunn tube heads. I found my Model T's to be a bit too crunchy and aggresive for all-around bass use, but that's just my personal taste.
The 2000s is another option. Plenty of guitarists, some fairly notable, have achieved good results using 2000s', and they're obviously AMAZING bass amps.
I'm currently using both a Sorado and a later model, 6550-driven Sonaro for dual guitar and bass duty, and I'm very pleased with the results.
In general, I think it's safe to say that any old Sunn tube bass amp will sound "good" for guitar, but you'll probably find yourself needing a pedal or two to get a really good guitar tone from those bass amps.
I don't know much about the later solid-state amps, but some of them have excellent reputations and seem versatile enough to suit your needs. I'm sure someone else on the forum can help us out with that.