You know, I was going to make some suggestions like switching the i7 to an i5 because hyperthreading on a quadcore CPU is pretty worthless for just about everything and getting a 6950 1GB over the ti, but how about I show you how to make up your own mind instead.
www.techreport.com
on the top you will have a menu to check out various types of hardware, all benchmarked so you can see what is actually the best stuff for you.
My suggestions for articles are:
CPU:
http://techreport.com/articles.x/20486
GPU:
http://techreport.com/articles.x/20293
as for your case, I will suggest an antec 900. Just leave the top fan off and turn the three 120mm fans to low and you will have great cooling for very little noise. Side/top fans actually disrupt airflow and do very little to help.
edit-----
actually the antec 300 woule be cheaper and still offers 2X120 front 1X120 rear. You might want to look at that instead