If you are only doing "some" video editing, then the i5 will be enough. Now if you were a graphic or video artist, and doing it daily and for a living then i would suggest otherwise. Here is a build I made up. Let me know what you think, or want to change.
Your total will be 1982.53
Personally I would look into a different case, I just chose the one you listed in your build. Maybe the 400R
Something with good airflow to cool those GPU's. Also, if you are OCing (you probably will be) you might want to pick up an aftermarket cooler. The 0 maintenance WC loops work pretty nice and silent.
Hope this helps!
EDIT: If you need a CD drive
, add $20
If you want to save a little money, you can get away with a 750W PSU
, but I like a little overkill with my PSU's. Edited by Ironman517 - 10/12/11 at 8:21pm