Basically fine, but a couple of obsevations:
Case: The 690 is a decent case. There have been numerous versions. Not that the old versions were bad, but always suggest double-checking which version you're actually buying.
GPU: The HD7870 is good GPU. Personally would prefer Gigabyte, MSI, or XFX, to Diamond. You also need to be aware, if not already: if you are using Windows version of CS6 for video, it uses Mercury Playback Engine, which, in turn, uses CUDA (exclusive to nVidia based GPUs), for graphic acceleration. Doesn't mean AMD won't work, but you lose that "speed" feature, with them. Adobe recommend Quadro, or nVidia, for their CUDA capability. Not a huge issue, but something to be aware of.
Mobo: ASRock is OK, and decent value. Would personally prefer to spend a little more, for the quality of Asus, or Gigabyte.
PSU: The CX500 is adequate, but may be worth considering XFX550.
RAM: CS6 "eats" RAM. It's not a bad idea to get 16GB(2x8GB). You don't specify EXACT RAM, but you want 1600MHz Cas 9 (or 10) DDR3, with voltage 1.5, or below.
CPU Cooler: I take it you mean 212Evo, that's the best one.