I'm planning on building a i7-920 rig with a budget of $1300-1400.
I plan on using it for graphic design and video editing (also probably some 3d rendering) and some gaming on the side. This is my first build but I've already done some research and have selected a few parts.
Please give some comments and recommendations, thanks.
40GB is not much space for OS and programs, and SSDs like to have a certain percent free for best performance and on top of that the V series probably isn't the fastest SSD around and I don't think worth the money. I think it's better to wait for SSDs to mature in both performance and price. If it was me I'd get one of the two fastest mechanical harddrives as a boot drive: Samsung Spinpoint F3 500GB or Seagate Barracude 7200.12 500GB.
Seeing as you won't be corssfiring then you do not need a 750W PSU. A 500W would be fine. If you change your mind about being able to crossfire or want to keep the option of a more power hungry card open then a 600-650W would be fine.
And as long as you buy RAM that is slower than the mobo's stated maximum RAM speed then it will work. One clue to this is that the memory support list on the mobo's website will have modules with speeds of 1600mhz and 1800mhz and 2000mhz. So it's no problem getting 1600mhz RAM for your build.