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That's you, right? I see you're doing dual monitors. IMO, dual monitor's are a no-good for first person shooters as the split is right down the centre. It's better to stick to one monitor or if you really want multiple monitor's get 3 monitor's, as that would really enhance your field of vision.
I would also recommend an upgrade to your GPU to at least a 6870 or a GTX570. While your present card will run the game on medium settings on that resolution, keep in mind that you're running multiple monitor's which will require additional power. A 5770 (even at those speeds) may not cut it. Your CPU/ RAM/ PSU are good.
Also remember that BETA releases don't demonstrate all the features of the full game They're simply an indication of what to expect from the full release. All features may not be available in the BETA (DX11, etc). So if you're able to 'max' out a BETA isn't a guarantee that you'll be able to max out the full version.
Hope this helps.