Personally I think the Aria is great! I was seriously considering a Shuttle, but they are a bit pricey and use a proprietary form factor for the cases/mobos. My only complaints would be that putting in new cards requires removing 6 screws. Two hold the bracket directly on the back, but you also have to unscrew the three PCI cards and AGP one to physically remove the bracket, allowing you to insert another card. Also, it is a BITCH connecting the IDE and power cables! The drive cage is easy to take out, but once you put it back in, you have very little space to reconnect everything. I have a CD burner and two hard drives installed. The Aria comes with one rounded IDE cable and I recommend buying another one. The extra flexibility will make a difference.
The pluses would be that it looks awesome, and it's just slightly wider than a Shuttle case! There are two blue leds in the front, one on each side. The case is simple to take apart. One screw in the back, and the top slides off. Both sides just have a tab to press on, then they just slide forward and pull right off. The front panel perfectly covers the tray to your optical drive, and the eject button lines up with the drive's button perfectly. The card reader is a plus too...who needs a fdd these days anyway. My next challenge is figuring out how to make my pen drive bootable...