Don't buy into the Coors Field idea. I think over the course of a season it mildly inflates batters statistics, but doesn't mess with pitchers as much as people think. I've seen many pitchers over the years have GREAT games at Coors.
"They said his splits between home and road are to great."
If you look at park factors several years into the past, you'll notice the majority of national league parks are pitcher's parks. (sometimes as many as 12 of 15) Rockies players will almost always have large home/road splits due to this, especially since AT&T Park, Petco Park, and Dodger Stadium are among the most pitcher friendly in ALL of baseball. Sure Helton's splits are large, but his road numbers alone could almost qualify him...
Home: .350/.447/.527
Road : .289/.389/.475