Jim Carrey to guest star on THE OFFICE season finale

Before Jim Carrey appears on screen in Mr. Popper's Penguins (opening June 17)he is making a trip to Scranton, PA to star on The Office. He joins a comedy ensemble of cameos for the seventh season finale, all competing for Michael Scott's (Steve Carell) job. The cameos include, Will Arnett, Ricky Gervais, Ray Romano, James Spader and Catherine Tate. Will Ferrell made his debut on the show last week. He is currently appearing in a four-episode arc, the story suggests that his character could stay on for the finale (maybe for good?). I enjoyed seeing Ferrell ont the show and am looking forward to all the guest stars, including Carrey. 

What are your thoughts? Who do you think should take over for Carrell?