You really want Sale more than the others, IMHO
Bard is a nice dark horse to really excel at a high level once he fully converts back but the risk is big hes already having some health issues but I think if all these guys could magically with a wave of the wand be successful starters tomorrow I think Bard has the highest ceiling. In the end I think he ends up back in the bullpen. Heres hoping though as a Sox fan he can help the rotation.
Feliz I worry just how much he relies on the fastball. Is that a natural thing for a reliever to throw more of those? sure -but even for a closer he really went heavy on the FB
As others have mentioned though if the prices are too high on any you dont want to invest too heavily as theres already some risk with each and the higher the price/investment the higher the risk
"I'm the man with the ball. I'm the man who can throw it faster than F***. So that's why I'm better than anyone in the world." - Kenny Powers