How's Crysis, btw? I love the opening HALO jump scene. Also when the sun comes up and level 1 just opens up.
Tweaker's tip: copy these commands into a .txt file, rename it system.cfg, then put it in steam/steamapps/common/crysis. Gives some depth to the lighting that I think is lacking, removes a couple SSAO errors, increases draw distance for objects and vegetation, drastically improves textures, improves water reflections, and blurs more edges (Looks fine at 1080p, and also there's a side effect of thickening the foliage). Some of the commands are taken from Warhead's files, since Crytek improved the highest settings for the second game. Some of these commands I can't imagine playing without.
e_view_dist_ratio_vegetation=65
e_view_dist_ratio_detail=50
e_view_dist_ratio=100
r_DetailDistance=12
r_DynTexMaxSize=135
r_UseEdgeAA=2
r_TexturesStreaming=0
r_SSAO_downscale_ztarget=0
r_SSAO_radius=2.5
r_SSAO_amount=0.7
r_SSAO_darkening=0.4
r_HDRLevel=0.75
r_HDRBrightOffset=8
r_HDRBrightThreshold=3
r_WaterUpdateFactor=0
r_WaterUpdateDistance=0
Can't believe no one's linked this guide yet, either. http://www.tweakguides.com/Crysis_1.html