For small plants and private,
we recommend this: Linksys WRT54GL

        
LINKSYS Wireless-G Broadband Router 54 Mbps 802.11g, WPA, QoS, 4P switch, Linux (WRT54GL)

Wireless-G Broadband Router
The All-In-One Wireless-G Networking Solution

* All-in-one Internet-sharing Router, 4-port Switch, and 54Mbps Wireless-G (802.11g) Access Point
* All configuration are done by us.

For larger plants such as hotels, marinas, etc.
we rekommend proffesional mesh system.

This type of router is special design to be fitted in large hotel, and anywhere you want too expand your wireless network. All configuration are done by us.