Sell high on Hamels? Are you kidding? This guy, when healthy, already has one of the best changeups in the league. Hamels is premier talent, as he develops this eason his K ratio will be where Kazmir's is most likely.
Cain's minor league stats are absolutely insane. I would likely hold onto Cain because he seems to be gettin g better after working on the mechanics, I would also hold because of the low value as of now.
Verlander is kinda like Cain, as someone noted above, because him, Cain, and Billingsley were always compared as "close aces", they were alwasy regarded as hand in hand. Verlander's wokload bothers me, his stuff does not however. I would hold/buy low on him because of the weak division and K potential, also the offense is getting better which translates into more wins.
Felix is a buy low candidate, he has a huge ballpark, the offense is coming around with Beltre and Sexson, he also Ks a good amount of major leaguers even at his age.
Liriano is a tought one. His value is high because of the wins and K ratios, but he got those as a reliever. People cannot buy low because his stats are good, cannot sell high because all his stats came as a non-starter. I would just hold on. The Ks are good, the offense is weak, and the stuff is electric.
Sean Tracey has my apologies, we all know Ozzie Guillen is an idiot. I'm rooting for you!