Advice on GPU dilemma, for Skyrim/BF3

Hey guys, I am looking into getting a new videocard to run battlefield 3/Skyrim!

my specs (the important ones at least):
-Intel core i3 550 3.4Ghz
-EVGA gts450 1g (yeah i know, its not that great)
-8gb 4 sticks ADATA memory
-OCZ FATALITY 550w PSU

I play at 1600x900 resolution, also AA does not really apply to me that much, I will usually run games with it very low or not at all, because honestly if a game is engrossing to me, I won't notice every little edge.

What I really want to do is run battlefield 3 at ultra or almost ultra, same with skyrim.

I was really looking into a GTX570 but in reality, that is a little too much for a videocard for me.

This is the card I am looking into

http://www.newegg.com/Product/Product.aspx?Item=14-130-...

now, is this card sufficient for BF3 and skyrim? at least on high or nearly ultra on a 1600x900 resolution with AA disabled?

or should i shove out the extra $100 and get a GTX570? like i said I really want a 570, but that would really hurt my wallet because I plan on getting an Core i7.