6.5 or 7mm WSM
(maybe both) and have at least one extra barrel built at the onset, 27" .900 muzzle barrel.
I'd get a Spencer of Rock barrel (only because I've had good luch with them... don't know about others too much). In the 6.5 I'd shoot the 142 SMK and don't know what in the 7mm.
Action... I like the Remington but would probably use a 40X single shot over the 700 repeater.
I like the H-S Precision PSS type or M24 type but also like the McMillan HTG.
Badger rings and bases.
Schmidt & Bender scope (don't have one yet) but so long as I'm spending someone else's money.