At some of our smaller remote sites (5-15 employees), we are using a single AirPort Extreme base station. For the most part, this works well. However, we have some older devices and printers hardcoded with the network password and it's not so easy to change in the devices for local end users. That makes it very difficult to change the AE's password. We want to do that on occasion for security reasons. One AE base station can cover a whole site. The solution would be to create four SSIDs - one for general use (would change password frequently), one for printers, one for scanners and one for guest access. The limitation of only being able to use one SSID per AE hinders this approach. We would have to purchase four separate AE's to handle it (about $800 total). For larger sites, we use a true wireless controller and APs, but that is expensive ($6-8k). I'm looking for a happy medium here. Any suggestions on how to accomplish this using AirPorts or alternative solutions without going the wireless controller route?