As everyone's basically said, the 932 is a little bit smaller, but don't be mistaken; it's still big enough for most people's use (even with watercooling). Also, I have found that its side-fan has been useful, as opposed to the HAF X's window. Also, the HAF X takes you to a slightly higher price-point where there are other cases you can consider. The Xigmatek Elysium used to be about the same price as the X and offers a bit better cooling options (plus an interesting featrue of a 120mm fan slot one the door behind the CPU. Then there is also the Thermaltake Thor, which is less expensive than the 932 at the moment.
I guess the general point is that when it comes to full-towers, most have comparable cooling performance. It becoems a matter of how much you want to pay, and what aesthetics suit your taste.