Nocturnal Warfare Windows, Mac game

Update on model progress:
grenade-Finished
Ammo box-Finished
Glock18 - (decided to add it) Finished
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Other weapons , I am working on today
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I am thinking or using cryengine 1 or 2 because 3 looks like its gonna demand a lot out of pcs and old comps can't play it. Yes , I know the features I lose when I pick cryengine 1 but it doesn't matter (it can make games can't it?) What engines do you guys recommend (don't say udk )
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Have a Nice day, GMModder