Unless this is a really shallow league (8 teams) I would not drop Hunter, you should be able to trade him.
To answer your question, I have two options.
1) Safe play : Derek Holland. I agree with the other poster. Holland will give you some pretty decent across the board stats, but I don't see Holland as any better than a #4-5 starter in a 12 team league.
2) Risk play : If you want to go for a huge payback, then it Nolasco or Billingsly. I'd give the edge to Nolasco due to his high K rate, I like the Marlins offense this year, the bullpen is strong, and maybe he finally figures it out and stops imploding on the mound this year. He always has 2/3 really bad outings, and you can't predict when.
Please help with mine. viewtopic.php?t=442432