Well now we have a budget as well, $ under 1K, 450 yards, threaded for suppressor and close to the ergos of his bolt action comp gun.
IMO for a new purchase rifle it Pretty much puts it in either :
1) a threaded CZ455 with a boyds tacticool or VPT stock or new CZ457 ( 60 degree bolt lift, better trigger, everything else pretty much same as 455 model) VPT or tactical stock
2) tikka Tx1 as a pretty good bet (no hands on experience yet, opinion based off using their CF guns and rimfire central reports, should be gtg)
I expressly left the savage models out as I've seen too many magazine and extraction issues with them, Accurate and less expensive, but frustrating getting issues ironed out. Anschutz makes a fine product for the squirrel shooter crowd, but out of budget and their mag design sucks for quick changes. Ruger RAR barrels are a lottery for accuracy that doesn't have good odds.
If used, I'd look for a DJ(Don Smith) prepped CZ in the classified PX , they show up here occasionally.
There will be other opinions chiming in soon.