Depends of what you're looking for -
If by "shooting" your looking for the most accurate and "shooter friendly" rifle - the M1A is the way to go.
If you mean "shooter" as in inexpensive and fun - the price you'd pay for a low end CMP garand (about $400) will more than make up for the more expensive 30-06 ammo.
308 ammo is cheaper, but you'd spend at least $1200 for an M1A.
Of the 3 choices, I understand that collecting carbines is are real kick - prices are going up fast. Collecting Garands is a fun too.
As the M1A is strictly civilian production, not sure if it got much collectability.
Oh yeah - if you couldn't tell from Maddon's post - owning an M14 is a no go due to its full auto feature - that's why we have the M1A, wich is the civilian production version of the M14.