I do more video editing but also enjoy gaming as well. In edition this will also host a server for Halo. My main question is what is the difference between a "Phenom II X6 1090T and the FX-6100 Zambezi ?.
I did find this thread "http://forums.extremeoverclocking.com/attachment.php?attachmentid=160726&d=1319505559"
From every review I've seen the performance of the 1090T will be consistently better than the 6100. the 1090t keeps pace with the 8120 on most tasks and runs non-optimized code better. For video editing the 1090T should provide solid performance, but really the GPU and Disk array should be your primary limiting factor.
What kind of video do you edit, length, resolution and target (web, broadcast?)
What program do you use? It is unlikely that it is optimized for the new bulldozer architecture, though it may have been optimized for the 1090T and it's ilk.
Overall the short answer is the 1090T should be better for video if you need to edit today.