I have the sx830 and love it. In looking at the design now, I convinced that it would not take muc hat all to order the spare parts from Antec to add a second hard drive cage below the one that comes with it. I just didn't want to deal with the door. It all boils down to how many 5 1/4 bays you need (3 vs 4) and how many hard drive bays you need (3 vs 4). With the modified 830, you can get 6 internal hard drive bays. I only needed two for now.