Behringer V-Amp
...Modeling Shit. I like it for Blues, Jazz, crunchy and clean tones, but I can't get a good metal-sound out of it. Plus i prefer tube amps over modeling.
Bad Horsie Wah 2 (Steve Vai Signature WahWah)
It's not a multi-effect, but it's....amazing.
If you have the money, get a (used?) line6 pod xt. Then you can buy the "metal-package" and update the pod. That's pretty cool!