This has been a most educational thread. Much thanks to Condor and BaldEagl for hashing out that PCI-e 2.0 business.

That is an issue that is important to understand and especially not overreact to.
Getback said it exactly right too that you can't get the perfect build. As soon as you make your purchase you'll find that the price of that video card drops by half or some 3.0 something-or-other comes out and you're behind again. I've always said that you make your best choice and when you submit your shopping cart, you close your eyes, stop researching, and just enjoy the toys! That's pretty tough to do though.
As for the Antec 900, I must confess that when Condor showed it to me for consideration, I liked it so much I bought myself one. I love it. Yes, Alskahawk is right, there is no fan in the side panel but if you use something like a Zalman 9700 cpu cooler (the best cpu cooler made IMHO), you will neither have room for a side fan nor the need. There are so many fans in this case already that I've had to place some books on top of mine because it wants to lift off and fly around the room.
Finally, I really think it's worth getting a Raptor for your system drive. I have run Raid 0 on previous builds and the extra performance is wonderful. I always felt uncomfortable though about the liability of failure. So, I went back to a 7200 rpm Caviar drive after that but on this latest build I decided to give the Raptor (I bought a 75GB one) a try. It really is fantastic. I noticed an immediate difference. To me, it is worth the extra money, especially as a system drive. You can always put a cheap Caviar in as a D: drive to hold all the stuff you download from the I. Again, just MHO.
Great thread boys!

BTW, you can see my rig
here.