DH485 to Ethernet network?

Hi all,
I have several SLC 5/03's and 1200 micrologix networked with DH485.
What I am wanting to do is tie this system in with our plant network (10/100baseT ethernet).
Should I change the 5/03's and go with 5/04 or 5/05 to get the port on the PLC or is there a good way to access the DH485 network where I can address all the PLC's on the network?
This would be for accessing data only.
Any thoughts appreciated!

One of our customers has achieved this by using the 1761-NET-ENI module. They simply convert the DH485 to ethernet, though you will only talk to the processor at 19200. The other option is to upgrade to 5/05 which is pretty costly as well.

Rob

Thanks for the reply.