I like Chuck Hayes, but not on my team. I say no thank you to a 6'6'' center, even as a back up.
As for Kurt Thomas, I really don't like the guy, and he's very old, but he might be the best we can do as far as free agent bigs for the minimum.
Michael Redd will probably get a chance at a starting gig somewhere (maybe Chicago, if they don't sign J.R. Smith or Jason Richardson), and I don't think I'd want to rely on him to be healthy for the season anyway. I'd rather go with Delonte / Wafer / Bradley / Moore and see what we get out of them.