you have two very sub ordinary QB's, I would bet there are some ok QB's on waivers. i.e. Rattay (injured for a week or so) Harrington, Palmer, Warner (he will play much better through the season) Testeverde, Garcia, Gannon.
I have yet to see ANYTHING out of Leftwich but over inflated hype. Just take a look at his stat from last year and through the past pre-season.