Sky's pretty good...they actually get their baseball lines out by like midnight the night before, although they don't offer their RLs at that time. I like them a lot more than I like BookMaker (for baseball, that is). I guess it depends on what exactly you're looking for, but I personally like them for baseball.
I've heard good things about The Greek and WSEX too. You might want to pose this question to the entire Baseball forum and/or the Offshore forum. I'm sure you'd be able to get a lot more information that way.