Many may disagree with me, but I would reconsider buying anything you don't absolutely need for a 68K mac. I mean think about it the hard drive is Tiny. You say yourself that you only want to use it for word processing. Just get the system set up the way you want it and burn a copy to a CD/Zip what ever. Or, if you ever have a problem, wipe the drive and reinstall. On that small a drive that would probably be a lot faster than any utility you could buy. It would also be foolproof.
With today's huge hard drives and complex systems that can take several hours to install (not to mention replacing gigabytes worth of Data) disk repair utilities make sense.
On a 580CD 68K mac that probably isn't even worth the $45 dollars you paid for it (I bought a quadra 650 on ebay 3 years ago for $25) The utilites may not make sense.
Do not misunderstand me I like the idea of making use of an old mac, Just be careful about spending too much money on it.
Steve