I will not try to tell you that you have to move to OS X, Apple is already doing that. In fact, they have made their new systems UNABLE to boot from OS 9.
So whether you have to "upgrade" to Mac OS X or you want to, I can inform you what the costs and benefits/disadvantages are for your case specifically.
With hundreds of Migrations under my belt, I can perform this task with 100% success and at a cost lower than you might think!
Training: What good is changing your operating system if you don't know how to use it? I provide training custom tailored to your needs.
If you want to preview the new Mac OS X, click Here.
If you want a quote on how much it will cost you, click Here.
Here is a OS 9 to OS X cheat sheet for those of you that want to get started now.