You should get your self a cry baby wah. They are the bset and Slash uses ´em too. Than he plays somtimes with a talkbox (solo in Anything Goes for ex) too but I have never tryed it. The sound cool and I might get one. Richie Sambora (Bon Jovi) uses talkbox a lot.
cheers, mind you I'm still conviced there is some way of getting at least a similar sound out of my multi effects, mind you I've not really played with the humanizer much because it doesn't seem to be very good.