p.s. - would there be any significant difference in what you'd recommend now vs. a few months from now? Anything major on the horizon that could serious affect my decision?
There is a new "monster" nvidia card coming out, and AMD should have a dual GPU card coming out, other than that, just price cuts.
Just be aware the 2GB (not the 1GB) 6950 is flashable, and IMO it should be enough to run at that res with good details, but like you said, if you want to run Metro2033 with everything turned on, it won't do so well.