i think his sig is pretty cool... as for best wah, its up to you, but i've heard good thing about morley's... used to have a base model morley wah, it was ok, i'd imagine the bad horsie is a bit better
I've never liked Wahs all that much, but if your set on getting one, I dont think you can go wrong with a Crybaby, I used to have one, and it was pretty nice, despite the fact that I didnt ever use it.