GPU Comparison.

Hello! I'm building a PC, and I'm going to order my graphics card tonight. Newegg has a list of GPUs that come with Assassin's Creed 3, and I though that they might be better than the one I chose because they come with the game.
I'm mainly planning to play on Minecraft, World of Warcraft, Defense Grid, and maybe some other ones, but I'm not sure how beefy my GPU needs to be for most games.
Here's the GPU that I had chosen:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Here's the list of GPUs that come with ACIII:
http://www.newegg.com/Product/ProductList.aspx?Submit=E...
The GPU has to be able to be powered by this PSU:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
And this Motherboard:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Thank you very much in advance!