Hi Mike,
If you want to use RIS option, you need to run Ghost Boot Wizard from the RIS server. But just for the PXE option, it is too much to configur a RIS server. If you search for PXE in this forum, there are previous posts on that topic. (Make sure to select all posts when you search, default is only 90 days).
The 3Com PXE server CD is included with GSS, there is docs on that too.
I do not have the details right now, if you are unable to find them pls let us know, I will post them.
For your situation I believe that you will have more advantages if go with PXE server, since it will serve as a general purpose DOS boot method.
Krish