If I were to put a WLC in a DMZ to act as an anchor for guest access, wireless primarily possibly wired later, as there are no APs connecting directly to the WLC I wouldn't need a high capacity WLC would I? Bandwidth, processing power and number of SSIDs would be the limitations.
If sopme one could confirm that would be great.
You are most correct my friend
Here is a clip from a Cisco Training "White Paper"
"Guest access points do not have to be joined to the anchor controller. The most cost effective controller to use is the Cisco 4402 series controller. This controller can support up to 40 connections to foreign controllers, 2500 guest clients and provide two gigabits of forwarding capacity."