Hey I used to have an FCB1010 foot board and now I have a GNX3. I was using the FCB1010 to control a non Behringer product, and while the board is very flexible, I found it cumbersome to program.
Then Gnx3 is pretty cool and I think it sounds great. The interface for adjusting the effects parameters is kinda goofy, but once you get used to it, it's not too bad.
I know the Gnx4 is out now and I believe it has USB capablility for the recording end of things. This is a big upgrade from the smartmedia card in the gnx3.
I'm not at all famililar with the v-amp 2 but I have been very happy with my gnx3, and it is easier to program IMHO than the fcb 1010