Go for the ATi, even in non-graphics rich DX11 games (of which, ever game coming now is DX11), the performance is noticeable. DX11 graphics are more about performance thatn "oooo, pretty".
More memory will make it use less system memory in theory, but most modern games will take up your RAM no matter how much you have before graphics. More memory on your GFX card is a significant performance boost because the likelyhood is that if your textures can't fit in VRAM, they will be on the swap-file instead of system RAM.
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