Which boar to use?

Hey guys, I'm new to this site and thought I'd throw a question out and see if I get any feedback. I have a super monster gilt that I plan to breed in April. She has tons of muscle and great foot size and bone. She tracks very well. She is a bit round in her hip structure and could use more gut. What do you think would be a good boar to use on her to soften put a square hip and more "middle" in the litter? I was thinking of going with a good york....any thoughts?

If you plan on using a York, I would strongly recomend Buffallo and Shipleys.