Nobody ever said air cooling isn't good, or can not overclock well, but this thread is about how good water cooling is, not air cooling. 😛
As I said earlier, h20 cooling is more expensive and as American Zombie has pointed out Air cooling has gotten better. So the cost incurred in going h20 may or may not be worth it to you. That really depends on what you value and what you will use it for. If you love the look and the ability to OC with minimal noise generated for your efforts then its worth it. And in all reality, 200-400$ for a complete water cooled rig (CPU, GPU, Chipset? + Pump, Rad, Fans, Tubing, Reservoir) isn't that expensive imho. 400$ being on the high end side... Sure its more than an aftermarket cooler, but when we spend 1.5k - 2k+ on our systems, whats another little bit to keep it cool, increase the lifespan of the parts and keep it quieter?