Daniel Hudson WILL get better.
he has 53.0 LOB %. that's crazy high. he still has great K numbers. I don't think he is as good as he was with Arizona last season, but I think he's closer to that than what he was with Chicago. pitching in the NL West always helps.
I don't trust Lewis. pitching with Texas doesn't help for pitching numbers. he was good for some of last season, but the ERA went up as the season went on.
if I had to rank them I would go.. Hudson, Dempster, Lewis.
if you can trade 2 pitchers for 1 good one then that could always help too, not only to get a better quality pitcher than either of the 2 given up but freeing up a roster spot to help elsewhere.