Today I would go for a rather similar system with these changes:
12 GB RAM
Noctia NH-D14 CPU cooler (even bigger)
NVidia GTX-470 or 480
The rest of your components are up-to-date, no need to change anything.
Just make sure that you get a big tower so the cooler fits in. Take a look at what Baz (Studio North) and Rowby recently built.
Mickey, are you planning on any overclocking in this new system? If you are not or only slightly then I can recommend another cooler that I am very pleased with and it is the Coolermaster Hyper 212+. I added the optional second fan to it for push-pull operation. Very quite. I am running an i7-980X overclocked to 4.0 GHz and with 100% CPU usage I never see over 70 degrees C. And the significant advantage is the you could even use and change out tall memory modules without removing the fans as can be seen in the picture below (I am bench testing here--it is not yet in a case). It is not as big as the Noctua, but also not as expensive and unless you are pushing to the ultimate limits, I believe a great solution. They have developed a new cooling method with their direct contact heat pipes.
Once your setup goes into a case, it will soon start to get hot inside, especially with the heat the gtx ouputs.