I think you did good slayer.
However here is my opinion on a few details.
1- The 3570k processor from intel is an exellent choice and just like the rest of your list follows a very good "bang for the buck" pattern. However unless you plan on overclocking you could go for a regular i5 3570 and save yourself about 25 bucks. Same proc just with unlocked multiplier.
2- Cooler Master cases are just AWSOME, however the haf 922 is a huge case. Unless you have 5 hdd's 3 gpu's water cooling etc. you could very well take a look at the CM 690 II Advance usb3. It's a fantastic case and again you'll save about 20-35 bucks and it looks like the terminator also.
3- The Asrock Extreme4 is now 4 dollars cheaper than the one you chose and it has better bandwith distribution (8x8 lanes for pci express3.0) so you can buy another gtx 260 for 40$ on ebay and sli away giving you about 70 percent more speed (frames per second) further futureproofing your new build and considering you already have a very good psu that can easily handle 2 gpus, 3 hdds, 5-7 fans and 16gigs of ram plus an overclocked 3570 with room leftover, i would seriously consider it.
Other boards worth looking at are gigabyte's z77x-d3h with everything asrock has plus more new usb 3.0 ports and Asus p8z77-v lk, Both in same price range as the one you chose but have more features especially the 8x8 lanes which for a gaming pc is a great advantage. You can buy the other gpu later if your budget doesn't allow for it now.
Also the Gigabyte mb has better onboard sound and more usbs than the Asus, i think its important.
4- The ram you chose is excellent however if i was building a new rig right now, i would go for 16 gigs.
Gskill offers 16g kits and also faster 2133mhz 16g kits in the form of 4x4gig modules (not overpriced).
Unless your budget is really limited you really should go for 16g now as it is the norm and again adds a good measure of futurproofing. And with the money you save on case and processor, it pays for the ram.
5- Since you plan on using your existing hdds, well its doable however the best way is to completely format the drive cause remnants of mb drivers might give you headaches for a week or more.
Good luck with your new baby.
RaG