Then I'd say get the black version. It should blend in with the rest of your computer setup, and trust me when I say that people will compliment you on how sleek it looks. The fact that it has great cooling and a 5-channel fan controller at the top is a huge bonus.
The white and red ones are flashy. No doubt about that one. The black one is sleek and powerful looking, so that's my recommendation.
Here's another option:
LIAN LI ARMORSUIT PC-P50
Lian Li are considered the "Porsche" of computer cases. If you're going for conservative with great cooling, that's a wonderful case to get. It will beat the pants off the P183 for cooling performance.