For video cards, you get diminishing returns as you go up the price scale. Unless you just absolutely have to have the very best, there's no reason to spend so much on one.
SLI doesn't provide as much of a performance advantage as you might expect, either.
Honestly, I think $6000 is way too much to spend on a gaming computer. For half that you can build a system that will perform just as well.
Power supplies are important, but the brand is more important than the wattage. It has to do with build quality, really. Very few systems will ever draw more than 500w, so anything in that range should be just fine for you.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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