Since this is an impossible what-if question, I'll pick a gun that does not exist. I would want a Stainless Steel version of a Rem 7600 with a fluted, med-heavy contour barrel, chambered in .30-06. On it would be a scope that doesn't exist. A Leupold VX-7, 2.5-10x45 with the additional lens coating of something similar to raiguard but even better.
I guess I dream big and live small.