Best budget gpu for arkham knight?

[Aceiscoolpro]

I currently have a gtx 650 ti 1gb which is capable of playing arkham city on very high settings (no dx11 and no physx) and with 2xmsaa at 1080p and it keeps a stable 60fps for the most part. I'm wondering if i'll be able to play arkham knight decently on this system if its optimized for pc well enough. Does anyone have a good prediction? I also have a core i5 3550 stock and 8gb ram which i think is good enough for arkham knight. I am hoping to get a graphics card soon but two things i want to know is if this system will play arkham knight at atleast medium settings 1080p at 30fps - and what gpu would be my best buy to play this game maxed out 1080p with atleast 2xmsaa at 60fps. I'm thinking a 770 would do the job but 2gb ram sounds waaay too small so i'm thinking of waiting for an 870 which could come soon this year and could have 4gb of vram (my guess if 880 has 8gb ram). Any idea what my best gpu would be for a budget of 200 pounds? I'll buy a new gpu if i can't handle arkham knight.

 

[ak47jar3d]

I don't know if you will be able to run 2x MSAA, but a gtx 650 will put you on the high preset(dx 11) at about 45 frames in my estimation.