Isn't maxed out the same as High?
Anyway since I moved to a Opty/7800GT rig I just turn it to native 1680x1050 and put everything on/high. That includes High AF and 4x AA. And it still runs smoother than my Barton/9800 Pro rig did at 1280x768, no AA/AF, medium and low graphic details.
But for those who need additional FPS, try the tweakguides.net BF2 guide. They have low/med/hi comparison shots so you can turn down the details that hardly matter but drop fps but keep important ones at medium at least. For example. if you need a little bit of additional fps, these are just fine at medium as opposed to high: terrain, effects, textures, lighting. Dynamic shadows and dymanic lighting should be no higher than medium unless you are running everything maxed at plenty of fps (like me, w00t).