First let me direct you to Springfield web page; www.springfieldarmory.com They give a quick overview of each of these rifles specs. I went through the same dilemma as yourself before I purchased my M1A.
First what will you ask of your M1A? Home protection, Range Matches, Hunting, ect... Mine was all the above, so I choose the "scout" as it has a 4" shorter barrel, this shorter barrel will allow you to acquire targets quicker at closer ranges & also has a forward scope mount (which serves the same purpose).
Yes, you lose a little velocity with the shorter barrel, but I'm confident that this rifle will still shoot well up to 500-600 yards.
As for the diff between the std & nm, yes I think these is a big diff. see Springfield web page for the details.
As for wood vs fiberglass, I would go with wood if you plan on entering matches, I think you can only have glass bedding done to wood stocks, but fiberglass is about 0.3lbs lighter
Let us know what you decide!