I own a SFDR ('77) which I recently "blackfaced." Well, I blackfaced the vibrato channel and PI, but did some minor tone stack mods to the normal channel. I love it, but then my goals may be different than yours. IMO, versatility is partly the guitar, partly the amp, and partly the player. You can stretch things a bit more with different speakers (build/buy various external cabs and try different drivers in them). Pedals...well, I hardly use them anymore. I find my tone is much less constipated/plasticky/sandy with just guitar straight into an amp.
If you want an amp that can do clean (I put a 12AY7 in V2 on my SFDR for more clean headroom) but also get some classic tube overdrive tones, an old Fender is a good choice. The Deluxes can get pretty danged loud with an efficient speaker. I also have a SF Vibro Champ which is another fun one. Not as loud and with less bass, but class A which gives a different overdrive sound and no rectifier sag. Love it, too. Or you could build a tweed Deluxe (raunchy overdrive) or tweed bassman (tone to die for).
I may build one of those Ceriatone TMB EF86 18W deals sometime...then there are the Voxen, the Ampegs, Magnatone, Supro...
Summary: no one amp is going to do it all well. One that does a few tricks will probably not do anything very well. Pedals...no comment :razz:
A P
p.s. Get on YouTube and search around...there are some OK clips of various amps out there. One guy has some really nice stuff with Deluxes and Celestion Gold speakers.