Take a long, serious look at the Aimpoint Comp ML-XD, or the newer ML2. The ML-XD is essentially the same as the M-XD (except for the lack of the night vision settings), which is also know as the M68 Combat Optic and is in use by the US military. The ML2 reportedly has even a longer battery life than the XD series.
Talking with those who see lots of guns and equipment subjected to heavy use indicates that the C-More sights are okay for gun games, but not for serious work.