Apple no longer sells old versions, you'll need to look to eBay, etc.
The retail 9.2 will work on it, as well as any retail OS X 10.2 to 10.4. (10.5 will work with the help of an OpenFirmware hack.)
If you don't plan on moving it, you can just have the drives sit on the floor, no bracket needed. I run mine with one drive in a bracket, one "loose" on the bottom.
The retail 9.2 will work on it, as well as any retail OS X 10.2 to 10.4. (10.5 will work with the help of an OpenFirmware hack.)
If you don't plan on moving it, you can just have the drives sit on the floor, no bracket needed. I run mine with one drive in a bracket, one "loose" on the bottom.