I agree with what's been mentioned. If you have the spare horsepower, then crank up the AA. When I had an nVida card, my settings were:
Anisropic Filtering: 16x
Antialiasing - Setting: 32xS (8xS or 8xQS, if need to lower & not 16)
Antiasliasing - Transparency: 8x Sparse Grid Supersampling (need to lower to 4x if using 8xS or 8xQS)
Negative LOD Bias at Clamp
Texture Filtering: High Quality
Triple Buffering On
Vertical Sync enabled