The Varadero would indeed be good for the high speed cruising (depending on what 'high' is of course), and would probably deal with the gravel roads. However, the alloy wheels would tak a pounding (though I suspect they would survive Ok), and the 21" front wheel that is fitted to the TA and AT will ride potholes far better than the small tarmac-biased one on the Varadero. They really do use 21" wheels on bikes that have some off road pretention for a reason. For those reasons alone I would keep to your original selection. Other than that I have no idea how the linked brakes of the Vara behave on loose surfaces.
I haven't ridden a 650 TA, but from sitting on one I would say the seat height is fine for me. I'm 5' 9" as well (never let anyone near my inside leg, so no idea what that is. Ooooh, suit you sir!). I have to say though, the later (RD07) ATs are also fine for me. Despite only being able to get the balls of my fet on the ground, I've only dropped the bike once, and that was getting on with luggage. Conversely, my previous Transalps went down a lot - mostly while paddling around parking. I put this down to the fact that the AT has got much better (lower) weight distribution than the 600 TA. Maybe this is less of a problem on the 650.
If in doubt, go for the TA as it certainly will be up to the job - with the proviso that the aluminium bashplate of the AT will be more protective on gravel. With the idea that both bikes are up to the job it's mostly a matter of testing each to see which fits you best. Also, which you can get - there seem to be many more TAs around than ATs these days.
Stig
"Only one other animal on the planet wears shoes, and only because we grab them by the legs and hammer them on." Christopher McDougall
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