Need Wireless Access Point suggestion!!

[Wyck]

I'm looking to install a WAP for a business to offer free Internet to its customers. Budget is not extremely high. However, I would like to be able to limit all *outgoing* (not just a basic firewall for incoming traffic) traffic to basic HTTP and Email ports. What's a low-cost, reliable WAP (802.11b is fine) that will allow me to do that? Thx!