I am running the 5870 card baby!
First of all, driver issues with ATi is a long gone problem with IL-2 ever since 10.8 came out. Those who still suffer from problems with an ATi card running IL-2 has to blame something else pl0x, because it sure as hell ain't the drivers. Your supplier needs to get with the times. I play both RoF and IL-2 on 10.8 drivers, all maxed out(Perfect Landscape in IL-2) on my 5870 with no hassles what-so-ever.
The fastest card you have among those three, OP, is the 5870. The 6870 is a revised and improved 5770, and a GTX460 is similar(give or take) to a 5850 performance-wise.
What you CAN do to be on par with upcoming SoW's DX11/tesselation is to up a notch on the GTX. The GTX470 is a powerful card, and surpasses the 5870 in many areas except heat and power consumption. The 5xxx series ATi is a bit immature in DX11/tesselation and when game devs really start running DX11, I'm going to upgrade my card as well. The GTX470 also scales extremely well so that's a great upgrade possibility for you if you should decide to run two cards in the future.
My specs:
Q9550 @ 3.7gHz
8GB RAM
1GB ATi 5870
Gigabyte UD3P(P45 chipset) motherboard.
I've had no reliability issues at all with my 5870 and it runs very nice and cool on water. The stock fancoolers on them are good enough though but nowadays there are many versions of the 5870 on the market with upgraded coolers, so I'd go for one of those instead. Doesn't cost much more than a stock card.
Finally, it would help us if you posted your computer specs though. If you're going to buy a new graphics card, other components should be in the same league.
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