Congratulations!
I hope you get as much use and enjoyment from yours as I have from mine.
Suggestions: Obtain at least one type XX (20 round) magazine for display purposes. They run around $20 at gun shows. The 28AC with vertical foregrip and short mag is truly classic.
Also, buy a horizontal foregrip for use with your 30-round magazines. That way you have a twin to the Marines-in-Central-America version. It was featured in movie "Windtalkers" and was used by Sgt. Saunders in the "Battleground" TV series. For that, you'll want to get a Kerr "Nobuckl" sling and some appropriate webb gear.
Pay attention to the tightness of the rear sight. The standard one on the WH gun is not so nicely machined as the original Lyman sight, but it is optically better, having an integral aperture sight without having to use it in the raised position.
Just out of curiousity - - Do you mind saying the approximate price you had to pay for yours? When I got mine in 1993, the going price was around $2500, but it climbed sharply afterward.
Best of luck - -
Johnny