RS-485 or Ethernet?

http://www.nuelectronics.com/estore/index.php?main_page=product_info&products_id...

Oooh, the price is right.

Would you/or anyone mind doing a quick feature comparison of the nuelectronics, WIZnet and XPort modules in the scenario I have described? Ease of addressing, and ease of use in general are more of a priority than cost.

Also, any thoughts on switching/routing in a LAN like this?

Thanks for the replies thus far everyone, much appreciated.

Rob.