Tough choice there, two good calibers. I lean towards the 280AI only because I shoot that cartridge in a heavy barrel long range rig. In the past, I've used a Timney trigger and really liked it. I've also had good results with the older adjustable three screw factory triggers if you can find one.
Look at Boyd's, they have a nice laminate stock that will fit the long action if you want to go that route. Glass bedding will need to be done and floating the barrel. You'll need to swap out the factory recoil lug for a dead flat machined one from Sharp Shooter Supply or Brownells as part of your barrel change.
You didn't mention a scope but, a good scope for the money, IMHO, is a Meuller APV 4.5X14. It's a good clear scope that will serve well on a long range hunting rifle.
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