Final Cut Pro X build

Hi,
I have ML instaled on Asrock Z68 Extreme 3 Gen 3, i5 2500k, OCZ Vertex 3 60 Gb and Gigabyte GTX 560 (non TI). The problems is: I'm working with FCPX and my GPU not helps me for this. I want to buy a AMD card but, i want to know, if isn't listed in FCPX compatibility list, will not accelerate FX and render? I'm not interrested gaming.

My options are:

1. http://www.newegg.com/Product/Product.aspx?Item=N82E16814102967

2. http://www.newegg.com/Product/Product.aspx?Item=N82E16814102908

3. http://www.newegg.com/Product/Product.aspx?Item=N82E16814102948

If someone works with FCPX and knows this thinks, please help me. Sorry for bad english

The HD6870 is your best bet.

Thx for reply! I have another little question: One friend have a HD 6750 to sell and his price is very good - about 40 dollars. Do you think this GPU can fit to my request and better buy 16 Gb Corsairs with remaining money? I repeat i'm not interested in games, so if this board can do close performance (from 6870) in FCPX, i prefer to spend that money for more RAM. Thx again!