There aren't that many unfortunately, like mentioned above Silverstone is probably going to have the most options. I did to the Air 540 what Snowdog mentioned with the Air 240 and was happy with it. The Cooler Master HAF-XB Evo also mentioned above is another good option.I'm looking for cases that let you mount the motherboard horizontally. Either mATX or ATX. So far I've only found the ThermalTake V 21 that has this. Any others?