For the initial cost and inherent accuracy out of the box...Savage. I'm shooting one that feeds the Whisper cartridges out of an unmodified mag box and produces sub MOA accuracy consistantly. You can swap a barrel out at home in 10 minutes and the bolt heads interchange in 5. Two good aftermarket triggers available,SSS and Riflebasix SAV-2. There are a growing number of aftermarket stocks available Choate, Bell and Carlson #2999 etc ,although the factory laminate isnt bad. Lots of factory parts available at Midway and Brownells.
That being said ...I'm doing one on an XP Remington for myself later this month. It'll be a PITA to set up, but like all Rems....It should shoot as good as a Salvage after I spend a day truing it up
If you know someone that likes to work in metric...I think Howa produces as good an action as anyone or CZ (mini mauser) if you'd like an action thats actually built around the size of smaller cartrides.