There's no "best board" in snowboarding, because if there was a definitive best board, it'd be the only board on the market. It's what fits the rider's preffrences best.
I'm not 100% sure, but i believe i saw reviews about the K2 board breaking very easily.
I'd say check out NS/Capita, but once again it's what fits a rider best, and i assume you did your research.
Good luck finding the right board for you.