Need help with my build

Hello guys i am new to this community . Please help me with my build . I usually do video editing and 3D modelling with my computer so is this build good for those stuffs ?
Core i7 3770k
16gb corsair vengeance
P8Z77-V PRO
Not sure which graphics card i am gonna buy . I am thinking of buying GTX 480 please suggest any other graphics card which is less than $200. Is this graphics card good for video editing and rendering ?
I will upgrade the graphics card later . I am getting a graphics card just for basic rendering and gaming now. And is the mobo good for SLI ?
Seagate 1Tb HDD
Please suggest me a good Power supply for the same . I can get corsair PSU's here not sure abt other companies .
Thanx in advance