Opinion on new graphics card

I have an MSI p67a-43c I am looking for a graphics card that is pci 2.1, 1bg and between $100-$200, not sure on which series to get
Looking to play SC2 and Skyrim with no problems. SC2 isn't as demanding as Skyrim but what is your opinion of these cards for my mobo?

Seriously considering this one: http://www.newegg.com/Product/Product.aspx?Item=N82E16814102908
SAPPHIRE 100315L Radeon HD 6850 1GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card with Eyefinity

http://www.newegg.com/Product/Product.aspx?Item=N82E16814102948
SAPPHIRE 100314-3L Radeon HD 6870 1GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card

http://www.newegg.com/Product/Product.aspx?Item=N82E16814121419
ASUS EAH6850 DC/2DIS/1GD5/V2 Radeon HD 6850 1GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card with Eyefinity