I would either put a switch in line with the power cord (a nornal wall switch is designed to carry that much current) or in paralell with the switch inside the monitor, but that's just me. The smart strip is the best way to do it, but I can't be bothered to go out and buy one (yet).
P.S. my friends often remark that I have no fear of electricity so if you don't want to hack a switch in, buy a smart strip