If someone wants to to the sniper thing, have you looked at Craigtop Archer? IIRC it can shoot any distance, but only 1x/day. Combine with OotBI and you don't have to worry about hiding (after all the penalty for spot is so high at long distances, any hide at all will serve fine).
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On to my personal questions...
1) Do you allow things from the Eberron Campaign Setting? Specifically, I think an Artificer would fit well in this "Modern Warfare" scheme. I was thinking about playing a human Artificer UMDing Warforged components, effectively looking like a cyborg thanks to robatic arms and what not. Let me know if you would be cool with this idea.
2) The other option I was thinking about playing is a Frenzied Berzerker. Normally the character is dangerous to play in a party cause he can't stop killing things, but the concept would be to drop him from air combat directly into a group of enemies. The Berserker can't be damaged while in his frenzy, so outfitted with the proper gear (including a few contigent heal spells activated by the end of his frenzy) it would be like dropping a bomb in the middle of the enemy. I saw this idea elsewhere but I thought it would work here. Let me know what you think.