As CBS CEO Les Moonves said, "there's only one David Letterman" — and he's the onlyLate Show host the series has ever known. Letterman's impending retirement is still a year out, but that doesn't mean we can't start thinking about his eventual successor. Here is our top 10 list of picks.Jay Leno We had to. Moving on.9. Craig FergusonThe logical choice, Ferguson, who has hosted the Late Late Show since 2005, seems like Letterman's heir apparent, and his contract expires this year. But unlike Conan O'Brien, who made sure a Tonight Show deal was in his 2004 Late Night re-negotiation contract, the Scotsman has never voiced a desire to succeed Dave — nevermind the fact that his strange humor might not mesh well in the earlier hour, something of which he is well aware. "I don't know if I want to be any more famous than I am now," he said in 2009. "There's a world of pain that comes with 11:30 that doesn't exist at 12:30."8. Jon StewartEven Ferguson wants Stewart! "I think Jon should replace Dave if Dave decides to go," Ferguson said in 2008. "I think Jon has earned the job." Stewart, whose Daily Show won 10 straight Emmys for Variety Series, certainly has the respect and name for the job. Dave's also a fan of Stewart's, having been the final guest on The Jon Stewart Show in 1995 and even signed him to his production company. Plus: Stewart — whose Comedy Central contract is up next year — took a three-month hiatus from The Daily Show last summer to direct a movie, perhaps indicating he's ready to move on from the gig.7. Stephen ColbertLike Stewart, Colbert's Colbert Report contract expires next year, and after 10 years, he might be weary of playing his satirical conservative character (especially after the #CancelColbert misunderstanding). While Colbert has the chops for Late Show, will people be ready to see the real him?
6. Arsenio Hall
A familiar face to older viewers, Hall just returned to late night in September in syndication, and his show is distributed by CBS. Days before his show premiered, Hall says Dave personally called him to appear on Late Show.