Another suggestion I might make is to be patient and wait to buy accessories until you understand the platform and know exactly
what you want. Believe me when I say that I have a lot of door stops and paper weights around my place that came about by changing my mind after I already had something.
Also, depending upon your needs, don't get too caught up in things like flashlights and the kind of crap you'll probably never need, but that have the coolness about them. That stuff you probably won't need unless you're going into a combat or close-quarters situation.
I'm new to the platform, but I can say from experience what I think you should invest in: the best scope or optic (depending on your situation) that you can afford; a good sling; good quality (polymer) mags like the Magpul pmag; and a good (read Harris) bipod, which makes the sight-in and bench shooting process much easier.
Just my two cents.