Right now the top-10 QBs in the NFC (according to my rating system) are:
1. T Romo
2. J Garcia
3. B Favre
4. E Manning
5. K Warner
6. M Hasselbeck
7. J Campbell
8. B Griese
9. J Kitna
10. D McNabb
I would guess that Romo would be the starter with Favre and Garcia as the backups. Garcia could start if he can stay healthy and continue to play at the level he has but that would be very difficult to do.
His stats after 7 games: 133 of 189 for 1504 yards, 70.4%, 7.96 avg. 7 TDs and 0 INTS and he is 4-3 as a starter. Those are pretty darn impressive but I can't see him continuing at that pace all year.
Favre is a media darling again this year with Chris Berman & Co. drooling all over him. He will get in no matter how he plays the rest of the season. If not for the phenomenal season Tom Brady is having he would be touted as the best QB in the league by them.