<<Disclaimer: Verify this information before applying it to your situation.>>
Here is a summary of the responses received on recommendations for a mixer strong enough to handle the GF dough:
41 Total Responses -
Kithcen-Aid - 32 (several recommended the Preofessional Model)
www.shopkitchenaid.com has an outlet store with discontinued models that are less expensive and still carry the full warranty on them.
Sunbeam - 3 (contaceted Sunbeam and 1 rep said their "heritage" series will handle the GF dough and another rep said that their mixers cannot handle GF dough)
Braun - 2
Bosch - 1
Viking Pro - 1
Farberware - 1
Oster - 1
* Please carefully compose your subject lines in all posts *