Total worth: $949.94. You still have about $50 for a DVD reader, but I'm not very good with those so I'll leave that to you.
Now, the 2500k is a bit last-year, but it's still awesome. The 6950 is beastly(not as much as a 680 or 7970, of course) and you'll be able to put another one in down the road, if you feel the need. The mobo has full CrossFireX support, up to 4 cards. The PSU should be able to power 2 6950, I'm not sure, but if you go with more than 2 you'll need to upgrade it. The case has good airflow and "fantastic cooling from dual 200mm white LED fans". The memory is pretty self-explanatory: 8 gigs of DDR3 @1600MHz. What more do you need.
I think this system will work great for you, especially for $1000.
NOTE: The motherboard has a z77 chipset, so you won't be able to unlock the GPU into a 6970.
Isn't the case a little to expensive...? . Can you find a cheaper one, but big seize and simple but also stylish like that? Also a good airflow .
That's going to be kind of hard to do. I need to know the exact brand and the quality of their products. I'm sure there's some no-name case that's just as good, but 1/3 of the price. I checked out akamrcrack's suggestion and it's pretty nice. Looks good too. You can go with that, if you want.
You can even afford a GTX 670 in this case. The total will be ~1040$ though. If you get the 6970 you will save $50. The 670 seems to be about 20% better than the 6970, so if you can get a factory overclocked 6970 you'll be better off with that.