Wow. That's a crazy roster system. . .
Well, here's one thing about the Eagles . . . the offense has always been good, and it has always been funneled through McNabb. McNabb has had years of proven offensive talent . . . most of the time with crappy receivers (Pinkston, Lewis, Brown, Thrash, about 10 more I am forgetting because they are forgettable).
Palmer has had 1.5 years of phenomenal play, followed be years of sucktitude. He's solid now, but he's not going to turn into Palmer of 05 - 06. FF is a game of chance, and if it were me I would grab MCNabb and chance it. Having Brady and McNabb going most weeks has got be be the best 1-2 QB punch in your league.
Nut it out in the lean weeks and feast when they are both rolling. At least that's what makes sense to me, it might be different if I had some experience in that system, but it seems like if MCNabb doesn't pan out, bye weeks will cause somebody to dro pa servicable Qb along the way.