The difference between M1A and M14 is that the M14 can go full auto, although only the Hulk can control it after the first shot.
First of all I would suggest a Savage 308 rifle. It is simply the best value for the money. Very accurate and if you get one with the Accutrigger they are superb.
If you want a detachable 10 round magazine you should look at the Savage 10 FCP-SR
Experience is a very bad teacher because it first gives you the test and then teaches you the lesson.