The M1A is a fine rifle. I have one, and it shoots straight and operates reliably. I am very fond of it.
I also have a DPMS AR-10, which shoots the same ammo. It is pretty heavy but a pure pleasure to shoot.
If you want a weapon that makes you and others drool, get a Belgium made FN LAR.
If you are like me, being unable to decide clearly means you need them all.