If it means traveling to see the architect, I would vote Jan Stephenson, Lorena Ochoa, etc. If it meant to see their courses, well that's a wider field!
While not living, I have spent some time traveling back roads of Kansas and OK to see what some have said are untouched Maxwell courses, and I went to Australia just to see the best of Mac. Also went out of my way to see Strantz because they were so unique.
As to current signature architects, in some ways, I would think their volume of work would work against them. To many, why travel too far to see any but the most unique Faz? On average sites, he builds to his own will and while a fan, and I know he has done more cool stuff than most would give credit for, with so much product on the ground its kind of a seen one deal.....
I hate to say it, but I hear whispers of CC getting in the same trap of similarity. Tom Doak currently has the best rep for doing different things, although I think his portfolio is getting big enough as to where moving forward after his run of spectacular sites, he will have to battle hard to avoid the same trap, like everyone else.
Frankly, the work I am most likely to travel to see next is Lester George with Ballyhack. But, thats just me.