Peralta, Scarpetta, Odorizzi, and Arnett are all easy choices. I would also include the likes of Anundsen, Cody and Frederickson. I understand your point of "high ceiling" pitchers - but many "high ceiling" pitchers never pan out. A Suppan type pitcher for $400,000 a year instead of $12,500,000 is very valuable. Even when Rogers wasn't hurt - his results were mediocre. Butler completely feel off the radar until being promoted to AAA (then back down to AA), but his BB/K ratio in A+ was less than encouraging. There is certainly a push and pull between likely average MLB players and possibly great MLB players.