Hoser mentioned the reasons why an AI is at the top of my list as well. Second in line is a DTA SRS. The more I shoot my DTA the more I like it. The ability to run several calibers with one scope is definitely an awesome feature. Now I can shoot .308 to .338lap with only paying for one Smitty.

For a custom build I would go with a Big Horn or Surgeon action. Manners stock (with flushcups) although I like McMillan as well. A Bartlein, Krieger or other quality barrel. (I have not had one shoot any better than the others. Only had Kreiger, Bartlein, and Obermeyer. So can't comment on the others)

Trigger would be old style remmy or 40x tuned to perfection.

Glass would be an S&B with a P4f.

Bipod would be an V8 or a Harris. On AI it would be a PH.