Whenever I order two identical figures, I usually get one from Giantoy and the other from OSK, and just wait and see who ships first. lol
You can't go wrong with Kit.
I've been a customer of his for years, and he's been one of the most reliable, conscientious, polite and easily contactable retailers I've ever dealt with.
If you end up with two Gunslingers, and you can afford it, it'll likely be a blessing in disguise. I ordered a pair from Kit as soon as the pre-order went up, as with the outfit, sculpt and accessory options it'd be impossible to have just one.
So far GT has that win. But I gotta say, if you ever get a defective part on your figure, Kit will get on that asap, no hassles or anything.
And Amelia at GT is just so dang polite too. Both great places!