Cisco Wireless :: 1131s / Wireless And Apple Mac Woes?

Basically we have had a number of instances where the Macs just fall off the wifi.  Sometimes it's when they wake from sleep and other times when roaming between AP's (1131s with same SSID's).  Our standard install is WPA2 and per ap local authentication.  PC's work fine and never an issue.We have completed a survey with a spectrum analyser and no RF interefence is present nor errors on the radio interface.
 
Questions:

- Is there a preferred Cisco config/setup for Mac's to work reliably?  I've heard loads of rumors but nothing concrete and nor can I find anything specific.

- Should I be setting up WDS in case there is an authenticating issue.

- For those who are Mac gurus and happen to be reading. What Mac options we should look at?
 
This has all come to a head because the clients IT company who recommended the Macs (different from us doing the network infrastructure) are insisting that the problem is Cisco incompatibility and that we should rip out the Cisco kit and install airports.
  
Building configuration...
Current configuration : 2236 bytes!version 12.4no service padservice timestamps debug datetime msecservice timestamps log datetime msecservice password-encryption!hostname AP4
!no logging consoleenable secret xxxxxxxxxxxxxxxxx
!no aaa new-model!!dot11 syslog!dot11 ssid Home   vlan 1   authentication open   authentication key-management wpa   guest-mode   mbssid guest-mode   wpa-psk ascii xxxxxxxxxxxx
!dot11 ssid avnet   vlan 2   authentication open   authentication key-management wpa   mbssid guest-mode   wpa-psk ascii xxxxxxxxxxxxxxxx
!!!username abcd password 1234

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