10k? not sure what that will buy so lets say "loads" rather.. not unlimited or one would just say "everything -fully upgraded"
not necessarily all of following, but some, not necessarily in this order.
-Some top tuned rifle, both cqb and woodland, both gas for extra fun and AEG so that I just have to carry 1-2 hicaps and no vest.
-A bunch of TM 5-7s, so that I wont have to worry about propane killing them
-Enough mags to just drop them on the floor like in films

?
-Only "real" accessories (torch & reddot/x4)
-Have someone make me an AK5..
-Get some of that epic impossible-to-find-and-prob-cost-your-shirt Russian camo..
-Transport and walkon fees
...and that's all I can think off!
oh and I got a secret lil project idea I would launch
....find a site willing to allow parachute insertions and hire a small private plane to drop me in.
so that you can have the tactical advantage of being the only player with ammo left after all the players emptied all theirs on you

?