DDR3 is way too expensive right now... and as you said it yourself, the new boards with DDR3 support are Crossfire boards... and i want my Geforces (i've had ATI cards before and i had some bad experiences with them)
about the PSU, the 8800GTX draws around 150W on it's own, so even with 2 of them, there should still be enough power to keep the rest of the pc going (actually i bought this PSU for it's 8800-SLI-making capabilities)
about the CPU, i will be going with the new quad cores, but i have to find the most appropriate model for my rig, and for my wallet ;)
i figured the QX9650 would do fine, since it has the same FSB as the board and a 3.0ghz clock, plus it's Core 2 Extreme architecture
but the one Rikm12345 pointed out would also work very well... it has nearly the same specs, but it's not Extreme Edition, which makes it much cheaper... hmm now i have to find out the difference in performance between those 2
about the GPU model, that was some interesting bit of information there, i'm gonna look into the nVidia website and find out their specs (they have a very handy comparison chart there)
another option for me would be to buy just one 8800GTX, since i already have one installed, but it would have to be the exact same card, and i fear the 8800 chipset may have been revised already, and that would really limit my options
also, i think SLI could be just the thing for me, even in fsx, because i am running a Triple Head setup here, and that's a lot of pixels for just one 8800 to draw... (3840x1024

)
also, i'm thinking about water cooling for the GPUs, but i dont have any particular kit in mind yet... i heard there were some really good ones from ThermalTake, but i still don't know much about it... i mean, are they worth the money, and does it need a lot of maintenance?
thanks for the replies guys
Cheers
HarvesteR
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EDIT: just took a look at some HD prices there and whoa! fast drives are freaking expensive!! a 400GB 10000Rpm drive comes out for over 1000 dollars
hmm, maybe i'll stick with 7200rpm drives and a lot more storage space
i wanted 1TB of HD space, on 2 drives, one of which would be partitioned 2 ways so i could have a dual boot of winXP 32 and winXP 64, the other would be for safekeeping of my projects and other stuff that can't be easily reinstalled in case i ever have to format a partition (and we all know someday we will have to ::))