I would go with the 7850 , since they have 2gb of vram and it is cheaper then the 560 ti 448 .
The 7870 could be a nice option too but costs a bit more then a 560 ti 448.
That just my opinion , so you should wait a bit and get some advise from the more experimented members !
Cheers bro !
i was having a similar problem. but the 'normal' 560 ti. i worked out that an oc 560ti with 4 hours a day gaming would cost £35 more a year to power than the 7850 oc!!
even tho the 7850 is £40 more, in just over a year it will pay the difference itself.
I play ultra on my 1.2gb 570 on 1920x1080 all day and get 50fps average and no microstuttering (I compared it to playing on low which did not exceed my vram)Personally I wouldn't buy a 570, not enough Vram for games like BF3, i'm selling mine and getting a 7950 instead. Unless you want to play it on lower settings, ultra settings at 1080p is a big no on a 570.