It's more than reasonable, IMO. A rather large risk, but one that I've been willing to take in most of my drafts. I have him pegged for around .280-30-110, more if he can stay healthy all year. Hopefully he isn't too good though, because I don't want him traded from Coors.
Preston's looked good so far this spring, in case anybody is wondering. Legging out triples, running pretty well. It's been encouraging.