I enjoy my 460's and at $100USD a card just can't beat the value to performance. I'll dig them up later when i get home but there is several reviews of 2x460's doing as well as a single 580 and even better on some tests.

As for FFXIV on the 460 I've had no trouble at all since turning on VSync. The settings I use are: nVidia drivers 275.33 running fullscreen 1080, 4x aa, 8, 3, Texture Q - High, Texture F - Highest.