Ali,

If I was you (ie. money is no object) I'd definitely go with a pair of fresh 160sx's. You will not need any nose weight and I doubt you'd use any more fuel. Mine is set up the same as Billy's with 120's and the stock tanks plus two 50oz Dubros. The batteries are next to the nosegear. If I want to do any kind of decent vertical maneuver (like a 400' immelman) I've got to be full throttle for a good while before entry so that I can exit the top comfortably. With the 160's you'd be back on the power most of the time and just give it the juice when you needed it (when the nose is pointed up).

Then again I saved a bunch of change using an old pair of 120's and my plane is perfectly matched to my favorite wingman...Billy "Big Guns".