That's easy. Simply install OM and OMEGU in the prescribed order:
OpsMonsun_V705
OMv705_to_V720
OMv720_Patch2
OMEGU_v300
OMEGU_v300_Patch5A
I have no further mods which change graphics.
Graphics settings:
In-game: Everything maxed out, but fcs disable Post Process Filters!! It gives nothing but overbloom, like in a XBOX game.
Make sure that you have Anti aliasing working! I had to set resolution to 1400x1050 (4:3) instead of a 1680x1050 (16:10). Force AA and AF through driver. Otherwise it would not work.
From what I've seen in this board I would estimate 2/3 of the screenshots published have no working Anti Aliasing
PS: Even without Post Processing there will be that damn glowing of crewmen, does somebody know a solution for that?