That's a great setup. 1. If you don't need hyperthreading then I'd save $100 and go with the i5 2500k.2. Both Corsair and Kingston are great. 2 X 4gb is what you want to go for. Cl7 is a bit faster than cl8 although you won't see a huge performance gain and yes dual channel.3. Great choice.4. Asus makes great quality motherboards.5.Good6. It depends if you prefer water or air cooling, but both the Noctua HD-14 and the Corsair H100 are the more higher end CPU coolers.7. 1000w is plenty. I'd go with corsair because of high quality.
Hyperthreading - http://en.wikipedia....Hyper-threading- Most applications don't really use hyperthreading. 4 sticks would cause more strain on the memory controller and motherboard chipset. It would take slightly longer for the CPU to add and retrieve data from 4 sticks as opposed to 2. For this reason, 2 x 4GB would be faster than 4 x 2GB.