Board upgrade - intermediate rider
So I've been boarding for a few years now and I feel liked I've surpassed the level of my beginner board. I'm completely comfortable carving and I can easily board down blue hills, with my season ending goal of black diamonds. Right now I ride only on groomers but I would like to get into powder and backcountry soon. I am not interested at all in the parks. I was wondering what would be a good upgrade for me, something that would last me a while. Currently I'm riding the 2010 Atomic Vantage 148cm with flow bindings and I'm 7.5wms boot. Im 5'4, aprox 130lbs. Now I was thinking somewhere along the lines of 150cm for my next board but I'm not exactly sure about the lengths. Also, would I be able to keep my flow bindings or should I be getting new ones?
The board I'm currently in love with that seems to (according to my small knowledge) fit my needs, is the Never Summer Lotus. Thoughts?