Lidle gets you some nice K's. He's first in the AL in K's and 4th overall. However, he gives up too many earned runs. I do agree, he is a good sleeper pick.
Moss is notorious for walks. If you guys count WHIP or K/BB or another walk-significant stat...Moss will hurt you.
I like Tony Armas Jr. However, look at his career stats. He's never pitched a full season with an ERA under 4.00. His career split stats indicate he struggles after the All-Star Break. Don't forget he plays half of his home games at the field in Puerto Rico (very easy to hit homeruns).
Graves is just...ack!
I'd rank them in this order (top being the best)
Tony Armas Jr.