Token Ring vs Ethernet

HI everyone,
We are currently a Token Ring shop. Is there anyone out there who is also and might be or already has converted to Ethernet?
I am also looking for guidance re:mixing Cat1 and Cat5 cableing and 4/16 & 4/16/100 Token Ring Nic’s.
I am trying to come up with the best solution for the upgrade and expansion of our current Token Ring Network.

All comments and help will be greatly appriciated.
Also, are there any Lotus Domino experts out there?

THANK YOU,

Reuben
Network Administrator
Cheyenne, Wyoming