Get it, if later you get lazy and want a lighter rifle. You can get it, and you'll also still have your baby.
I got my first ten years ago. Some how, I now have two. I also have a fleet of others.
When I'm asked how many more I need, my answer is one more!
After or, before you get the M1-A. Go on the Firing line forum. There is a lot of info you will need. I only knew what was in the manual that came with the rifle. If you have an M1-A you need what you can learn on the firing line. Good Luck!