Good choices and good luck with them. I will say that the 8 pecan trees I got from Plantmegreen have since gone to the the great pecan grove in the sky. I believe all of the scions have bit the dust, but on some of them, the rootstock (Caddo?) has sprouted up.
Even if all of them did eventually turn into a big mature tree, I wouldn’t get any nuts, as pecans need pollination from another type tree. A Caddo is type 1, so I would need a type 2 tree for pollination. So looks like I’m outta luck there.
I posted my travails with my pecan trees in another thread if you want to read about it. We were talking about the difficulty in getting bare root pecans to successfully transplant and survive. But, it could also be that I was pushing my luck in trying get what are known as southern pecans to grow here.
@tennessean, I believe, had some interesting info about his trees.