Hi Michael --
I have a somewhat similar choice at Hopkins, was offered a trial of a newer EGFR drug (erlotinib)but since it started using IMRT, they can't change the technology mid-study, so if I opt for it, I can't have the tomotherapy technology.  (probably the issue with your 
Erbitux trial although certainly IMRT was around when that drug first came out?).
I think you really want IMRT -- the advantages over older technologies are well-established. Is the radiation in Anderson 
Erbitux trial 3D-conformal?
Course you can always go to Hopkins and do the erlotinib/IMRT trial there! <gr> 
Erbitux will probably be FDA-approved sometime in spring 2006, too bad it was not a bit sooner for us so available outside a trial setting. 
You should also be sure to see a dental oncologist -- 
I go in Monday for simulation and more meetings with radiation staff, and dental onc later in the week I think.
Good luck,
Barry