must be some big porkers you're shooting out that way jthunting, enjoy the toy, good luck with the shoulder too
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back on topic, price no consideration or not, If I were after a target 1500m+ 'rig' and didnt want to cut corners....there is a pun in there coming up shortly...
I would consider the barrel first and source no less than a cut rifled barrel. Lots of guys in the US are doing such work including at least one supplier in the UK that I'm aware of.
Then the action, well you could buy a proprietary action there are many out there, plenty info here
http://www.6mmbr.com/actions.html.... What I would do however would be to pick up a Savage Long Range hunter, as opposed to a stand alone Savage Target Action as the LRH is the only way to find a large diameter/long action Sav....:
You'd probably save on one of the custom actions but have a spare barrel, brake and stock....
BTW, you dont need a LM to get to 1500m, but I'm sure you know that...