What are you going to have on your guns when you play crysis 2?
for me I love the scar so I would use that heaps and i see that it wouldnt run out of ammo so fast now. So a Scar V2, underbarrel grenade attachment and a reflex sight.

Havnt played the but for me maybe -
Iron Sights
Silencer
Hologram
I think that would work good.

I havn't played the game either but I'm pretty sure I will use silenced weapons in situatuions where I'm watching down on the enemies. I like playing stealthy, planning much and being carefull, but I also like action. For me the action parts are best if they occur due to a bad execution of ones plan, as result for not planning good enough or having failed with the plan. That way the action parts become more intense and rememberable.

I haven't tried it yet aswell but I'm definately picking an assault rifle with high accuracy, equipping it with a silencer, hologram sight and if possible a red dot. Sidearm would be a small pistol, silenced and with a laser pointer. Carrying two flash bangs. Using the suppressed footstep sound, no shadow whilst cloaked and radar jammer. It's just the best stealth combo and would be very fun.

Also im thinking of using a red dot on the DSG-1 to see what its like

I shall use the AM A FIRIN MA LAZOOOOOH with nuclear fuel and liquid nitrogen.