Hey, a couple of things to note about gfx cards if you haven't bought your parts already:

- NVidia's card scale better in SLI/XFire still and generally provide more consistent frame rates. Tom's Hardware has new tests that check for dropped and runt frames that aren't reflected in frames per second but to the human eye looks like stuttering or lag.
- The GTX 770 has just been released and generally outperforms the AMD HD 7970, its about 10 to 20% faster than the GTX 680, and comes close to the GTX 780/Titan in some games. It comes in 2GB and 4GB flavors, but so far only the 2GB are for sale.
- WoW still runs a little faster on NVidia cards than AMD.
- AMD gfx cards have FAR better general compute capabilities that NVidia, so something to consider if you want to do any video transcoding.

That being the case, there aren't many new NVidia offerings with more than 2 or 3GB of video RAM, which is pretty annoying. There is a 7970 with 6GB of RAM available on newegg that would be nice for boxing:

http://www.newegg.com/Product/Produc...82E16814202005

This would be my choice if I were putting a system together right now. You get the 6GB of RAM, 70% to 80% of the performance of a Titan at almost half the price. You also get AMD's far superior general compute capabilities.