Some nice revisions you've made there. I've got a couple more suggestions for you just from what I've come across in my research.
For the graphics card, go with the
Sapphire branding instead of the Diamond. I asked around and people have been a lot more satisfied with Sapphire cards than Diamond, plus the warranty period is much longer, especially important with such a large investment. They cost exactly the same, so it won't impact your budget to switch.
Your power supply is a good choice, but overpowered for your system. Unfortunately, if you want to stick with a Corsair power supply and still have it be modular and 80+ certified (energy efficiency rating) you're not going to find anything better. I ended up going with a
750W Thermaltake Toughpower. While it's 250W less than the power supply you had picked out, it's more than enough to power your system and it costs almost half of the Corsair while still being from a highly reputable company, and it's still modular and 80+ certified. Ultimately your decision, but an excellent point to save money by being more efficient. Note I'm NOT condoning getting a cheapo power supply to save money. This happens to be a quality component that currently has $80 off in discounts and rebates.
Regarding hard drives, you can be a little more cost-efficient with your $/GB. There is no good reason for you to get two 250GB drives when you can get a single 1TB drive for almost the same exact price unless your plan on running RAID (which it doesn't appear you are). Instead of getting those two drives, spend $10 more from what you saved on the power supply and get a
single 1TB drive.
For cases, check out the Antec
900 and
1200 as well. Thermaltake Armor is a great case, but it doesn't hurt to look around. One great aspect of the Antec cases is that they use all 120mm+ case fans which makes for an overall quieter cooling solution. In fact, you can get the 1200 for less than the Termaltake Armor after all discounts and shipping costs. The 1200 is probably the most comparable to your current choice. Take a look and see what you think.
These are all just my opinions I've formed from the past few months of researching my own build, so take them as you will. Good luck as you pull together your system!