In a salary cap keeper league, I would only want to keep C-pep at bargain basement prices. I really thought he was a buy low after a solid performance to open the season against the Stillers (until the 4th quarter), but the rest of this year has proven that at least mentally, the 2005 C-pep is the real C-pep, not the 04 and previous C-pep. He could be a huge bargain next year if the running ability comes back, but he is only an average passer, and dangerous in leagues in that penalize turnovers heavily.
Bargain basement is hard to judge. As an example, in my league, he is $9 with a cap of $120. Manning is $22, Brady is $15, Hasslebeck is $13.5, but I have Delhomme at 5.5 and Roethlisberger at $4.5 and the minimum QB salary is $4. Is $9 a deal? Seems like you'd have to ensure that you had a very viable backup. If you are dismantling your team for a run for next season, do you really want to take on a high-risk, high-reward player or just save the cap space to bid on someone for next season?