Which Free Agent QB Could Replace Billy Volek?

Seemingly right under my nose, without me noticing, talk has begun about Billy Volek maybe going to the Carolina Panthers to challenge Jimmy Clausen for the starting QB job.

This would seem to make sense, with the Panthers talking about using their #1 overall pick on Auburn DT Nick Fairley instead of a QB. Bringing in Volek would not only provide Clausen with competition, but also with a teacher (who knows Rob Chudzinski's system). It would provide the Panthers, and Ron Rivera, with a backup plan for 2011 should Clausen not show any signs of improvement.

While Billy has certainly enjoyed his time in San Diego, and is best friends with Philip Rivers, it would make sense for him to try and win the starting job that he's always wanted before his body starts to quit on him. With a few seasons spent on the sidelines, he should be in great shape and ready to take the pounding that starting QBs have to deal with.

Should Volek leave for Carolina, what would the Chargers do with the QB position? Having one of the most reliable QBs in the league allowed the team to go with just two QBs last season, would they do the same thing? They could choose to carry three QBs, including a veteran backup and a project rookie (through the draft), or they could carry two. If they chose two, it would probably make the most sense to grab a free agent that has a little experience, a lot of talent and youth (just in case something horrificly bad were to happen to El Capitan).

Here's a full list of free agent QBs on the market (ranked arbitrarily). Based on that list, who would you go after and why?