I have the perfect board for you. It a new 2012 Never Summer Infinitey 156. It's absolutely a beautiful board and perfect for your weight. I promised to sell it to a friend but if she falls through. You could not find a better riding or built board for you. Especially you being experienced. And it's a rare size.
Besides that, you should look for a longer board. It will step your game up big time. I would go burton before I would go machete. But that's me.