If you are indeed using OBGEv3, just use one of the AA shaders, that is what it's there for.
http://obge.paradice-insight.us/wiki/Filter_(Effects)
Note: if your browser cuts off the last ) bracket, you will need to add it to url.
Edit: I also use a 6950 with bios hack. SMAA + HDAO work fine for me with Luminance HDR.