A few changes I would make. First of all your psu is over kill. A good 550w is more than enough to push that rig and then some. Also I'm 100% all for after market heat sinks whether over clocking or not. You can get a heat sink just as good as the one you have, yet cheaper. Here is a few changes I would look at down below....
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Intel Core i7 Processor i7-920 2.66GHz 8MB LGA1366 CPU, Retail
GIGABYTE GA-EX58-UD4P Core i7/ Intel X58/ DDR3/ CorssFireX & 3-Way SLI/ A&GbE/ ATX Motherboard
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If I went with Windows 7RC I'd have to reinstall next year. It sounds like you won't be able to just buy a license. Also, it looks like 64 bit Epson printer drivers are available. How about for video cards?
Maybe going with Vista and upgrading is a better idea?
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