Nice Hardware,
my recomendation, get a bit higher Wattage for power supply, 1000 - 1100W is safer when you will put in two GPUs one day (happens fast).
Flight Simulations are the first thing that can use twing graphics cards so make sure you have a double (or tripple) SLI or CROSSFIRE motherboard.
Definitively, I would not buy a CROSSFIRE motherboard and put an NV card there (you will not be able to put a second NV card and SLI it).
The next question is what kind of DirectX the games you play use (or OpenGL).
I am a NV fun myself (because the original IL2FB was running better in OpenGL and there NVidia was better) but I believe ATI is more advance in DirectX nowadays (I maybe wrong).
These new twin core GPUs seems to be the easy step to get high performance, I would recommend that you go this way first, it is easier (only one card) and cheaper (the twin card is approx 30% percent cheaper than two single cards).
~S~
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