Help choosing PC parts for gaming

I'm a 17 year old gamer who is on a pretty low budget. I have at the most $500 to spend and have chosen these parts so far. This will be running windows 7 ultimate.

Case - http://www.amazon.com/Rosewill-Black-Gaming-Computer-CH... (Great for my budget)

RAM - http://www.newegg.com/Product/Product.aspx?Item=N82E168...

CPU - http://www.newegg.com/Product/Product.aspx?Item=N82E168...

MOBO - http://www.newegg.com/Product/Product.aspx?Item=N82E168...

PS - http://www.amazon.com/gp/product/B001G0WPLK/ref=as_li_s...

But I need help choosing a good video card. I have looked at and seen a few good ones but I want one that is 1GB Memory (at least) GDDR5 and 256-bit. If I can't get a good budget card then I will settle for this one
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

My dad is giving me two of his SSD's with (I think) 400GB storage on each so HDD/SSD's are not added in the budget.

Also if you have recommended upgrades for my other parts then I will be more than happy to hear them. Thanks for your time.

PS - This is my first ever build so I am still new and learning so any tips would be appreciated as well.