Blockhead for Marshall, consider Germino as well though, check out www.steelbender.com
, and go to the spotlight area, Jason Barker and Greg Germino both demonstrate the Germino amps to their full capacity.
Also if you're handy you could look into an 18 watt kit, or have GDS amps build one for you, his prices seemed reasonable. In my opinion though the 18 watt, doesn't have enough "power under the hood" for the tones you describe, so I would recommend grabbing a JTM45 or Bluesbreaker style combo. For that album I believe Mick Taylor used his 50 watt head, and I'm pretty sure Keith used either Ampeg or maybe a Fender Tweed Twin, I know he loves the low power twins, so you may want to look into Victorias for that.
For the Vox end, I'd look at a Badcat Blackcat (by the way Willie's Guitars has one used, for a good price), or you could try a Matchless, or maybe one of the Vox handwired's that came out last year. I'd go Badcat if I was after a Vox sound though, I've played through enough of those, they have "it", all of them, the most toneful amps and VERY well built, think Sherman tank.
Beware of Mojave, lest you desire to sound like Van Halen, also they're a little rude.