Upgrading my video cards?

First my current computer specs:



Processor: AMD Phenom II X4 955

Motherboard: Crosshair III Formula

RAM: Corsair 4GB DDR3 RAM

Graphics: Radeon HD 4890 (2x)



I am upgrading my video cards and have narrowed my selection down to 4 cards



1. HIS IceQ X Turbo H695QNT2G2M Radeon HD 6950 2GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card with Eyefinity (2x)



2. HIS IceQ H697QM2G2M Radeon HD 6970 2GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card with Eyefinity (1x)



3. GIGABYTE GV-R697UD-2GD Radeon HD 6970 2GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card (1x)



4. VisionTek 900353 Radeon HD 6970 2GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card with Eyefinity (1x)



So (2x) being I buy two of them and set them up in crossfire. I will aslo most likely be getting 4 more GB of RAM with this purchase. Thoughts?|||Personally, I'd go with the GIGABYTE GV-R697UD-2GD Radeon HD 6970 2GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card. I've known Gigabyte to make some pretty outstanding equipment that I've used in the past. Highly recommend you go with Gigabyte.