RAS and the Radius Server

We are presently using NT4 and adding RAS services for our remote sales people, it has been requested that I sort out a Raduis server for authentication. We are looking at W2K upgrade later this year, so the question is do I use the W2K radius server?, can I just add this to a W2K member server in my windows NT4 domain?
Or would any one out there have a better radius suggestion? for information we have jsut purchased a 3Com Superstakk II Remote Access System 1500 if that has any bearing on your answers

Any help/suggestions would be most welcome !

Andrew