What would be the best GPU to upgrade to from a 4890?

my system:

750w psu
i7920 DO
cm v8
6gb ddr3
1080p monitor
4890 vapor x at 1000/1100

I'm debating on whether or not I should get the gtx 560 or 570. It needs to be nvidia because I like having physx. I am planning on sli'ing whatever I get in about a year from now. So for example if I buy a 560 now, a year from now ill buy another one and sli it. Im not sure if my corsair power supply could handle 2 570s? If it cant then do you think I should just get a 560?

If I go 560 I will either get http://www.newegg.com/Product/Product.aspx?Item=N82E16814127565&cm_re=gtx_560-_-14-127-565-_-Product or http://www.newegg.com/Product/Product.aspx?Item=N82E16814127569&cm_re=gtx_560-_-14-127-569-_-Product

and if I go 570 I will get this one: http://www.newegg.com/Product/Product.aspx?Item=N82E16814127568&cm_re=gtx_570--_-14-127-568-_-Product

so what do you think? Also, my budget is around $300. Cause i am goign to get about $100 from selling the 4890.
2 answers Last reply
More about what upgrade 4890
  1. anyoneeeee
  2. I had a 4890 and play everything @ 1920x1200 with no AA, went to a 5870 and it 2500k, and honestly could've waited for something in the future. The 4890 was fine for that res and no AA...

    depends on what you play really...
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