Look for something with rocker in it. This is NOT a gimmick, it will make it harder to catch edges (AKA fall on face) and easier to start riding powder. It should be soft in the flex, and suited for your weight.
I recommend the Never Summer Pandora.
Pandora | Never Summer Industries - Snowboards, Longboards and Accessories
Never Summer makes their boards right here in Colorado and stand behind their product.