I'm still wondering if it is wise to upgrade my current GPU (4870 1GB) to a 5870 1GB. I play at 1080p, and personally don't really see that much of a difference between 4x AA and 8x AA (or more). Same as with more than 8x AF. I guess a 5870 2GB would probably be better choice, since I run out of VRAM at times.

From a casual-bencher POV, would it be wise to upgrade?