Ok, let's try this again. From the sticky:
1. What YOUR PC will be used for: Mainly gaming, some CAD.
2. What YOUR budget is. $1250 including the components I already have.
3. What country YOU will be buying YOUR parts from. USA
5. IF YOU have a brand preference. None. I will go for any brand with a good reputation as long as it's the best component for my purposes.
6. If YOU intend on using any of YOUR current parts, and if so, what those parts are. As I mentioned the HAF922 case, plus the i7-3770K. The case I've had sitting around for a year, so no way to return it. The processor I gor for $280 a couple days ago which seemed like a very good price.
7. IF YOU plan on overclocking or run the system at default speeds. I've never OC'd, but I do plan to give it a try.
8. What resolution, not monitor size, will you be using? 1920x1200 dual monitors (reusing monitors, may upgrade later int he year to better ones)
9. WHEN do you plan to build it? March
To answer some of the other questions asked: I do plan on getting Win7, I don't see the point of Win8 without a touchscreen.
Are you planning on overclocking? If so, at least step up to the Z77 Ext4. (if not, then why get the K?)
I do plan to OC, although it will be my first attempt at doing so.
Your build is really weak for gaming, but good for video editing. For either build, there is fat that can be trimmed to provide a better experience.
For gaming, definitely go with mfenn's
$1000 build, but use a Fractal R4 case, and CPU cooler, and a copy of Windows.
May I ask why it's weak for gaming? I'm assuming that you mean I can go cheaper elsewhere and get a better GPU? I confess that I'm a bit at a loss as to which video cards are better between NVIDIA and AMD, and with what seems to me as nonsensical numbering schemes.