I'm playing with Newcastle and using a false number 9 as well. Didn't start off playing with this system, so didn't get in a striker better suited to the role, but having switched to the 4-5-1 system which incorporated the false number 9 I experimented with the strikers at the club in that position (I kept all of Remy, De Jong, Cisse, Ameobi, Gouffran). I've had the most success with Cisse at false number 9 and Remy on the left wing as an inside forward. Just reached January and Cisse has a solid 9 goals, and I've been rotating a lot so he's done that in about 13 starts as well.
Sorry this is a bit late, am a new poster and only just saw the thread! But have had the exact same issue so would be great to know who you went for and how successful it was!