I've done quite a bit of research and I've found that people have installed 10.5.8 on the 5315
Well it just so happens I have one laying around.
If anyone can link me (I've searched) or help me install 10.6.2 or higher on my 5315, that would be sweet.
I searched the whole forum and a member here named Weazle, actually did it, I already PM'd him. In the meantime though, no telling if he'll ever be back.