I like Vargas and Walker to make the list over May and Harrison. May should be at the MLB level by 2014 and Vargas and Walker have been run producers at every level they've played. I'm into guys who fill up the stat sheet (RBIs / HRs / Runs Scored / SLG% / OPS / Etc.). We have prospects who can get on base, now we need guys who have a history of bringing people in. These two will always have high K stats, but I believe they can get them down enough to be major factors (aka Sano) as they move thru system. I like Harrison, but I think he ends up at first base with Vargas being as / more productive with his stat line. Vargas can serve as a productive DH if 1st base was occupied. Walker is more athletic (Harrison), which brings greater versatility moving forward. He was also a first team All American at 1st Base in college (5 errors in a season / not bad) during his sophomore season. Polanco and Kepler belong right where you have them. They both have star potential.