I have since Black Friday outfitted myself with a rig that would fill the OP's needs quite well - or at least my own needs. Anyway I picked up a Kimber Hunter 6.5 Creedmoor for $656 and a Vortex Razor 2-10 HD LH for $400. The whole rig weighs in at 6 3/4# and shoots < 1" with handloads. Not sure this would be my choice for a buffalo, but all the others would be fine.

A true sportsman counts his achievements in proportion to the effort involved and fairness of the sport. - S. Pope