Thanks a lot for your help,
I think I'll probably stick to amd. If there's no noticeable performance boost, I dont think I'd want to spend another $150 for sandy bridge upgrade.
I ended up purchasing my build, except I chose the sapphire 6950 over the MSI 6950. MSI doesn't really honor rebates so I thought sapphire might be a better option.
So final price comes out to $718