...that I ever wanted to try, but lacked the money to buy.
We have a nice set of them already (in the Axe II, and presumably the Axe III also).
But I'd love to have all the Wampler, JHS, Bogner, Friedman, ToneBone, MesaBoogie, Keeley, WayHuge, etc. distortions and overdrives, to try out...