Good for you, then.
Yeah, you've got to see the foals these guys are producing.
I don't know what your issue is with #3 but to me, much as I love that color and he is an exceptionally good example of it, and much as I love generic draft horses, he looks pretty generic-draft-horse-y there rather than Vanner-y, to me. I strongly suspect that he is significantly butt-high and with a, shall we say, "loose" back (topline), and his head does not look as square as I think of Vanner heads as being, it is small and small-muzzled (fine for some things of course, and I have no clue what the Vanner standard actually calls for, but it is not very typical looking for the breed, to me)
I suppose of the four you've shown I would lean more towards investigating #1 more closely. Yeah, it would be a bit of inbreeding but not to a problematic extent (that's plenty common in horse breeding with no problems), and he seems decently shaped from what little you can tell, and is good n wide at both ends. You'd want to see a bunch of his offspring. One advantage of him, IF he is a good candidate otherwise, is the breeder's color guarantee, which could potentially result in your getting a second breeding at a discount.
Oh, btw the other thing to consider STRONGLY is how you are going to get your mare bred and what each one's track record is for that method... definitely something to look into. I am guessing you are maybe talking AI and transported semen? Try to find out a) how each breeder is to deal with, I know that in other breeds there can be considerable variation in peoples' level of orgnization and responsiveness and um number of brain cells available for the project, and b) what each candidate's success rate is via shipped semen. You don't want to be spending a buncha money on stud fee and containers and shipping and vet and all that, on a stallion whose success rate (be it because of his biology or his owner's psychology) by that method is rather low. If alternatively these would be live cover, again try to talk around to enough people to get a sense of how the farm managers are to deal with, because there's definitely some significant variation that way too.
Pat