Thanks guys, I think I'll probably go with the 2.5 fixed power, for two reasons, I kind of prefer fixed, and cost, the 1.5-6 is $750. and the 2.5 is around $200. for Leupolds.
Maybe or maybe not, but fixed powers are probably more durable, and on that caliber, that's a consideration.
RobCom,
good suggestion on carrying a second pre-mounted scope.
I live in and work in the middle east (am American), so a trip to Africa is definitely an option. Hope to do big bear with this rig too.