Get rid of the mounting bays in the upper section of that old Antec (I had the model above yours with the modular bays) and you will find yourself with much more room. (assuming you haven't done that yet)

What's the back look like? You might find yourself some unique places to run cables/air hoses/etc. (I used an old serial port slot that hadn't had the metal knocked out to install it, just bent it out of the way lightly and ran my wire/airtube)