You. Nail. Head.
Helton is a significant health issue. He was pretty bad last year, but had an intestinal disease, which caused him to lose 15 pounds.
I think he'd be an OK addition to the lineup, but he isn't the hitter of three years ago anymore. He's not going to make any lineup a "murderer's row".
Would I part with MDC for him? I guess...but I'd be a lot more hesitant to do it than most. Why can't we offer Colorado a couple of middle tier pitching prospects (Hansack, Pauley, Gabbard) for Helton? Guys like Pauley are young, cost controlled, and should be able to make the back end of the Colorado rotation.