Too risky to hope to land Favre. Looks like you'll need to make this deal. It is a downgrade but since you have two guaranteed starters it should work out.
12 team 2 QB leagues see lots of guys grabbing for backups once their QB gets hurt. You might keep an eye out for Orlovsky--Schaub is fragile and Orlovsky did respectably in Detroit last year (minus the safety in Minnesota).
Bottom line--having two decent starters is better than having one stud and nothing in the #2 slot.
Good luck, and please see mine:viewtopic.php?t=441525