I have built one on a savage action and actually done barrel change outs on at least 3 or 4 others and would highly recommend the Savage rifle as a platform for the following reasons:
1. With a little care and limited tools it is realitively easy to change calibers
on the savage due to the barrel nut.
2. Tools required are relatively inexpensive (under $100 total usually).
3. Allows you to go back and forth between the new barrel and old barrel
with as little as a 1/2 hour of invested time.
4. It come, go with the accutrigger, with an excellent adjustable trigger for
most work.
I would probably go with the something like the 12bvss in a caliber I like to shoot, for me .223 or .308 and then change out the barrel to .300 whisper. If you go .223 you are good to go, with the .308 you will need an additional bolt head which is no biggy. This gives you a good quality laminiated stock that is pillar bedded for the action along with a nice trigger right out of the gate. I have built these up using the cheaper models of Savage Rifles and find that once you have had to shell out for a decent stock you are right back were you were with the 12bvss price wise. I am not sure you will find much difference in the actions themselves.
The nice thing with doing the above is that if you decide the .300 is not your thing you can reinstall the old barrel and sell the .300 barrel, or if you find you will never use the old barrel the target fluted barrels are pretty easy to sell. Finally if you find you don't like the .300 or the old caliber you can pick up a barrel in any caliber that uses the short action, change the bolt head and for a few hundred dollars have a complete rifle.
One final thought, if you are into single shots to get the most out of accuracy and action stiffness Savage has a model that will fit your needs, I am just not sure what the model number is but it is slick.
Just one old guys opinion...
DonT