I've got a new build I'm fairly happy with so far and about ready to order parts but I wanted to get some feedback first if theres any noticable areas for improvement. My budget is $1500 Canadian, the system will see some fps gaming action but for the most part is general purpose and some business use.
Switch the board to an Asus P7P55D-E Pro. The price should be about the same, but the Asus will allow you to use Crossfire and USB 3/SATA III at the same time while the Gigabyte will not.
Is the Samsung Spinpoint F3 available? If not, get the 500 GB or 1 TB version of the 7200.12. It'll be faster than the 750 GB model.
Thermaltake isn't exactly the highest quality manufacturer. You also don't need an 850W unit. Check out the 750W units made by Corsair, FSP, SeaSonic, and Antec Earthwatts. All of these would be high quality and should be fairly cheap.
I'll do some more shopping around for the psu. You're definately right about the hard drive, I've been looking around for the 500GB version for a while now as that was my original intention, it's suprisingly hard to find it in stock and on sale (full price * 3 pushes it slightly out of my budget) but if I can find it I will, the F3 with the 32MB cache also appears to be scarce.
As for the MB I was orignally looking at the Asus MB but 2 things steered me away
1) Everyone who owned seemed to complain about a high pitch noise
2) Only one 1394 port (located on back), I require a second port on the front, the Gigabyte had second one available
HDD: Yes, it's hard to find in stock. It's the best drive out there. You might want to consider getting 1 or 2 internal drives and an external for backup. It may be a little cheaper than RAID 5.
1.) That's been a common complaint, but I believe it is just a problem with the batch. If you get a bad one, you can just RMA it. It's worth the hassle to get a better board in the build.
2.) Front ports are determined by the case. The rear panel are the ones that are actually run through the motherboard, while the onboard ports are the optional ones from the case. The Asus has 1 in the back and 1 optional on the board. I didn't check the case for one, but I assume it has one.