Well 1440x900 is more or less like 1280x1024 (actually its less pixels) so I'd say yeah, definitely max (or near max, you may need to turn off a useless "high end" feature or two) with some pretty acceptable AA/AF levels.
From my personal experience, 2X AA is all you need at 1280x1024 on a 19" monitor. (well 1440x900 on your case)