i'd recommend the latest beta patch cause it has the additional FXAASharp effect , also found in the user config ,
mine are
AToC=7; max
FXAA=17; max
FXAASharp=6; max
in game AA is disabled
you might wanna try the -malloc command in your target line,
recommended links
http://community.bistudio.com/wiki/Arma2:_Startup_Parameters
http://community.bistudio.com/wiki/arma2.cfg
and there's a bit of info in the folder called dll found in the
arma2 main directory