Well, your MB is definitely overkill, and getting a GFX card is definitely worth it if you're putting in the other stuff you're putting in. Also, 4 gigs of ram would be just fine for your purposes. As far as Ivy Bridge, it's really up to you. For your purposes, the only advantage would probably be that the prices of the Sandy series would probably drop. Here's my recommended build:
Also, even with the lightest possible gaming (anything more than flash games) I'd recommend a discrete graphics card. You don't need to dump hundreds of dollars into one if you don't want to. Something like an HD 6670 would give you passable frame rates in most games at 720p, with lowered detail. http://www.newegg.com/Product/Product.aspx?Item=N82E168...
I'd advise dropping the MB and getting a bit different ram, something like the G.SKILL Ripjaws 4GB, (beyond 4gigs does nothing for games, it's proven) and spending the extra on a 6790 or 6850 if your willing to dump a bit more into it for more graphics, it will get you easily to high-ultra on most games especially with your budget.
Yeah, Im thinking i will just spend a little more and get a decent graphics card...I might do some video editing, that mb deal is too good to pass up, Just in case i want to upgrade later . Which do you think has more bang for the buck, 550ti or 6850?