We have our AAV 17x9 rims on order so we are locked in on the 17" rim. I don't even know if the offer 16" rims anymore as that wasn't an option when we ordered.
It's looking like 35's are going to be the starting point for us, we are just going to have to be weight conscious for the rest of the build. I feel like it'll be much easier to move up to 37's if we run into weight, clearance, cruising speed issues in the future than to downsize to if we put on 37's and are immediately struggling to go 25mph up to the mountain.