Most DS and wacky plastics are fine in the 2-2/0 range. I've not really found anything that can't be done in that range. Currently I'm in love with the Gamakatsu Wicked Wacky.
Oddly, they hook nothing like a Kahle or Circle. The eye position makes a huge difference, as such the hook really tends to act more like a traditional "J" hook on the set. That's not saying that you need to power set them, but they don't need a slow sweeping set, like a circle, either. I'm really, really, really liking these hooks so far, and I can only see that increasing. The only size I've used thus far is 1/0 I see no reason to change that.