First off, welcome to the forum! And don't be afraid to post questions - most of us have been in your shoes at some point, and we don't bite (hard).
A couple points:
-What's your budget? Also, I tell this to all new people - if you have a budget, spend it. Don't spend $850, when you're willing (or budgeted) to spend $1000. If you do, you always think "if I only spent $X more and got that..." Set your budget, stick to it, and spend it.
-The RAM you selected will work with your motherboard, but you will have to fiddle with the BIOS/UEFI to get it to work at the correct speed. Since it is your first build, get a RAM speed (DDR3 1600) that is natively supported by the board. It's probably cheaper and the only difference you'll notice is your build was easier to get working.
-the 4670 is a bit dated. I will forewarn you I had trouble with a new build using the 4670 (the screen went blank during the OS setup)...BUT many people have not. Be sure to use HIS drivers (go to their website) - AMD has some basic drivers, but most AMD/ATI manufacturers tweak the drivers for their specific cards. And since we're on the subject...
-I prefer nVidia myself: drivers are more uniform and generally better. If you're going to stay with AMD/ATI, you may want to think about the 5770
. If you're willing to try nVidia, this 450
is actually on sale with rebate.
-If you'll be doing more gaming than video editing, you might want to try the Phenom II x4 965
- this is a great CPU and ~$60 cheaper than the 1100. If you're doing more video editing than gaming, then stick with the CPU you selected.
-Excellent PSU, but it is way more than you need. I tend to overshoot on PSUs and I think a good 600W would suffice. Still, if the Corsair 850 is a good deal, stick with it.
-Nothing is wrong with Win 7 Pro, but Home Premium is cheaper and has the Media Center (Pro does not). Unless there is something you need with Pro, Premium should be just fine.
Hope this helps.