Andy's right. That may have been the conventional wisdom at one point but it isn't anymore. The majority of bowlers throw 15# when it's hard to argue that the majority of bowlers weigh more than 160 pounds. As powerful as balls are, the carry is just as good at any weight (different from weight to weight but still good), so there's no automatic benefit to throwing 16# in terms of hitting power.
Really, throw what's comfortable. If 14# is comfortable and you don't overthrow it, use it. You may decide to move up later (I did), but definitely don't be ashamed of throwing 14#.
SH