James Spader, Ray Romano and Catherine Tate set to guest on OFFICE season finale

Earlier we reported that Will Ferrell was set to star in a four-episode arc on on The Office. Since then, there has been much speculation that he might become Steve Carell's permanent replacement. TV Line is now reporting that James Spader, Ray Romano and Catherine Tate are set to guest on the hour-long May 19 season finale as candidates for the vacant office manager position. They join previously announced finale guest stars (and possible Michael Scott replacements) Will Arnett and Ricky Gervais.

As TV Line points out, Spader and Tate are the likeliest candidates to take over based on their other commitments. Romano is pretty busy with Men of a Certain Age, Arnett just is locked in for another NBC pilot, and Gervais has already been in the UK position. I would love to see Ferrell take over, but all signs are pointing to that not being the case. 

What are your thoughts? Whow would you like to see take over?