Is Dynamic WEP Secure Enough?

Hi
I am responsible for a large wireless infrastructure upgrade.  Right now my 
plan is use PEAP w MSCHAP v2 with dynamic WEP crypto for my corporate SSID 
(I have others with much lower security requirements).  I cannot easily go 
to WPA without ditching all my current devices that do not support it (good 
luck getting that past the CFO).  We have a lot of physical security and 
surveillance with very tight controls, my primary area of concern would be 
people like myself sitting in the parking lot.  Due to one of our 
applications, we will be sending a clear strong signal to the parking lot.  
Is this enough security and encryption to significantly slow intrusion 
attempts?  Between direction finding capabilities of the Access Points and 
our roaming guards it would be a matter of time before we detected them.

Thanks

Rocko

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