How about a Surefire 6P ($56):

http://www.surefire.com/maxexp/main/co_disp/displ/prrfnbr/889/sesent/00

Only problem I could see with a Surefire G2 is that it doesn't have the lock-out tailcap (to prevent the light from coming on by accident), while the 6P does. Not sure how the "clickie" style tailcap would affect that on either model.

Stay safe over there.