I built this pc principally for gaming and a bit of photoshop/illustrator. Since I only use Photoshop and Illustrator, I didn't take a i7-3770k, considering this useless for those programs. I already bought the GPU and the PSU, I'll buy the remaining parts in Boxing day sales.
The only reason I chose that power supply is because it was on huge sale at 100$. Same for the XFX Radeon HD 7970, which has 70$ in rebate and 3 games with it (2 of them, far cry 3 and Hitman absolution, that I would have bought anyway).
For the case, I had 3 cases in mind: HAF XM, Corsair 500R and Define R4. I finally chose the Define R4 because of the sound proofing material and the overall clean look. That case probably isn't as good as the XM or 500R for the airflow, but I'll improve that by removing the HDD cages at the front, which will allows airflow from front to back, and by putting the SSD behind the motherboard.
I also have a 3TB external HDD for my movies and music, so I keep the money I would have spent on a HDD for a bigger SSD since I won't need one.
Finally, I will be OC'ing the CPU, that's why I chose the K version and the H100.