Get a G&P QD suppressor. They look col, are foam-filled, and are Quck Detach. It comes with a flash hider, but will work with the stock one as well.
Get a Magnification scope. ACOG replicas are great looking, but are pricey and not that great functionality wise. If you can get one used, for a good deal, you might want to consider it. Any military scope will work, though. The best thing to do is get a picture of a rifle you like, and copy it.