802.1x WPA in Windows Domain

I have setup wireless AP’s which laptops connect to using 802.1x Authentication with WPA (TKIP) encryption. My problem is that 802.1x authentication has to occur to open a wireless connection to the network, therefore users are unable to logon to the domain as this is attempted before 802.1x authenticates.
There are 3rd party clients available from companies like Funk, but it is $59.00 per license. I an looking for a modified gina.dll which allows 802.1x to authicate before logging onto the domain.