I forget: is that PCI or NuBus-based?
You may not have a choice. Of the many, many (that is to say, 3 or 4) flavors of Linux for Macs, most of them only run on certain hardware types. I think MkLinux is for PowerPC NuBus computers. There's some linux with '68' in its name: guess what processor that's for.
For "modern" computers, which yours may be, I think people like something called Yellow Dog Linux, and I thought there was another thing called Black Lab Linux. Dunno what's up with the dog names.
-Rob