I had a standard model once upon a time and sent it in to Springfield for their "Supermatch upgrade". I forget what the cost was, but I guess it must have seemed reasonable at the time. Krieger barrel, NM sights, trigger job, bedding, etc.
Anyway, when it was finished, my rifle was the equivalent of a Supermatch except for the receiver lugs. I later dropped it into a McMillan stock, but if you want that you can have Springfield do that, too. It is still a very fine-shooting rifle.
That said, you probably will find your AR better suited to highpower matches unless it's a real dog. Almost nobody shoots anything but an AR any more, at least in service rifle matches.
Edit: Good info in this thread: http://m14forum.com/accuracy/198804-nm-barrels-springfield.html