I never pre-order games, but I already know this game is going to be killer. With so many offers from different stores, I was wondering which one is the best to go with? I was thinking Amazon since they give you 20 bucks back for a future game purchase. Plus they give you a recon in-game helmet. For people that have done this through Amazon the 20 bucks is for any game sold by Amazon right? Released or future release.