Hmmmm... going from most important to least important...
Thunder Beast Ultra 7 Direct Thread from JAOutdoors - $1030 + $200 donation to the gov't
Nightforce NXS 2.5-10x42 - $1400 on the used market
Tikka action + bolt + trigger - $600
XLR Tikka long action chassis from JAOutdoors - $1403
Proof research prefit barrel - $950 from evolved ballistics
Unknown Munitions low 30mm rings - $105
Nightforce scope caps - $60
Magazine from XLR - $76
Lumley titanium bolt handle - $89
$5913 total for the last rifle you'll ever need.
Another option is a Christensen Ridgeline FFT in 7prc. 22" barrel, Triggertech trigger, Rem 700 inlet. Every now and then you'll get a lemon from them, but most of them are shooters. And then you can upgrade it over time. Buy a chassis for it, rings, suppressor, and scope... then if you want to swap it out for a custom action later you can without losing what you've invested.