Re: Need some advice on choosing one of these
Understandable, but a 700W should be sufficient. I've been running almost the same build as yours, but with a pair of 3870, and only a 700W. It's far more than enough.
I agree that 2GB is enough for XP, but I'm sorry, it's definitely not that great for Vista. I'm the type who runs multiple tasks, and I often leave my computer opened for several days, and let's just say I often hit 90% on Vista with 3GB on heavy loads. Again, the whole advantage of dual channel is debatable, but you could always order 2GB dual channel plus another 1GB for the sake. Although, at the price the 4GB are at, why not? Granted, you could always buy the other 2GB later, but remember shipping isn't free. Moreover, unless you're going to run older games, I suggest taking a look at Vista 64.
Now, as I already said in another thread concerning SLI vs Crossfire, I, as Murvel seems to be as well, tend to favor Crossfire over SLI, for its actual price/performance ratio. Plus, you can still run your 8600 GT on a Crossfire enabled motherboard.
One last thing, you can't go wrong on the long run with a good motherboard. Cheaper motherboards tend to run hotter, making harder for you to properly overclock, but that is definitely NOT the case for every motherboard out there.
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