Server Certificate for use with Windows PEAP Clients

Hi I'd like to get certificates installed on two of our FreeRADIUS boxes to satisfy the requirements of the Windows built in PEAP client when it does it's "Validate server certificate" bit. I have read about the requirement for the certificate to include the Server Authentication (1.3.6.1.5.5.7.3.1) OID in the Enhanced Key Usage section and I would like to know if anyone else has had experience of this. I have also heard about the special WLAN certificate available from Verisign which sounds like it will do the job, but I would like to hear from anyone who knows about an alternative as this one is a bit pricey. Thanks Ben Thompson