As if Amar'e Stoudemire didn't have enough projects in the works, he's now getting into the movie business as a producer of a Hollywood horror flick. The Knicks star, who's also a fashion designer and actor, is now in discussions with Relativity Media mogul Ryan Kavanaugh to executive-produce " The Strangers 2 ," a sequel to the creepy 2008 chiller " The Strangers ." The original flick starred Liv Tyler and Scott Speedman as a couple staying in an isolated summer house who are terrorized by masked assailants. It was produced by Relativity's Rogue division with a mere $9 million budget and grossed more than $80 million worldwide. Stoudemire raved about " The Strangers " at Tuesday night's Whitney Art Party in Chelsea. "Ever see 'The Strangers?' It's a scary movie . . . It's crazy," Relativity Media finances and distributes films including " Bridesmaids," "Limitless," &quo