#2
I haven't used this, but in general Behringer is not a good make.
#4
ISP decimator hands down, it is wayyyyyyyy better than the boss NS-2, or even the rocktron Hush, and other rack mounted noise gates/suppressors.
Main rig:
ESP Horizon FR-II
ENGL Invader 150
Mesa Traditional cab w/ v30's
ISP Decimator Pro Rack G
BBE Sonic Maximizer 482i

Back up rig:
ESP Eclipse STBC
LTD EC-1000 VB
Framus Cobra modded