T42.
That's the dilemma, Ally or Carbon?
If I get the Ally one then that's it, I'm never going to be able to justify another tripod, and lugging it around to get lovely landscapes will be its main use.
I think I'm talking myself into carbon. I already have a Manfrotto ball-head (to make my existing tripod vaguely user-friendly).
The pistol-grip ball-head by Manfrotto seems like a nice half-way house between a ball-head and a pan-tilt but I like the ball-head for it's total simplicity.
I'd go for the 3 leg version rather than the 4 because extending tripod legs is right up there with putting petrol in my car, or tying shoe-laces, for feeling that my life is slipping away.