I think in this case you need to look at enterprise level systems.
Do research and get in contact with all the companies.
AeroHive, Juniper, Meru, Trapeze, Ruckus, Cisco, Colubris...
You need to decide on various things such as
-Does existing cabling not permit APs going back to a controller
--Can they only go back to your layer 2 switching infrastructure
-Power over ethernet
Bare in mind that with some enterprise systems the standard rules of wireless networks do not apply (i.e., different channels on APs), some work in more complicated ways so you really need to get some professional insight into which ever solution you choose.
Depending where you are in the country I might be able to point you in direction of some suppliers that are useful to talk to.
Zen 8000 Pro
Edited by Pipexer (Mon 20-Aug-12 23:08:08)