I don't have any previous experience with building computers, so I would just like to clarify the following things:
1. Are all these components compatible with each other?
2. Is a 750W Psu sufficient?
3. Am I missing anything?
Also if you have any suggestions for different components I should use, they would be greatly appreciated, however I don't really want to spend any more money then I already am on it. I will be using the PC mainly for Casual Gaming and using AutoCAD, but might do a bit of video editing in the future too.
Agreed about the PSU, it's way more than you will need.
I'm assuming you'll be mostly gaming on that machine, if you want, you could switch to a 3570 and save a little bit of cash since I assume you won't be doing a lot of overclocking.
I've heard countless amounts of bad feedback on OCZ SSDs, it's up to you, but if it were me, I'd opt for a Corsair or Samsung.
Also, grab a caviar blue/black drive, they're not that much more expensive and perform better.