I have to think the target would be...
1. Cheap. Most important.
2. Intelligent. Knowing the entire playbook so the offense only has to adjust for throws he can't make.
Perez would have fit both in year two, but now he's probably not going to be cheap given how insane teams are with QBs. Draftee doesn't really fit item 2, so I'm sure they're looking at low end castoffs who have been around and clearly can't cut it as starters. Allen, who knows our system, for example. Maybe they'll make a run at a guy like Fitz, or McCown, who give us more talent at the position, but the key is that cost.