The half masks at ebabanned look really sweet but I gotta wait to order mine. I hacked up a paintball mask to allow me behind the ironsights and had to use my own shooting glasses. Do you use your iron sights? Cuz most the time I find my cheek needs to make contact with the guns stock and a mask gets in the way.
http://www.airsoftcanada.com/showthread.php?t=84298
Check the link for an airsoft minded paintball mask.