upgrading certified status

I hold a CNA designation for NW411.

I use to teach this course [CNA] to students at college.

Now, one of my responsibilities is maintaining a WAN/LAN made up of NetWare 4.11 / W2K SRV / AS400 mix.

Should I consider getting my NetWare 5 CNE? Should I just do my Netware 6 CNE instead?

David