Whats a good sized terrain park ( jib) snowboard for me?

im a really skinny kid im only about 116 lbs and about 5'7 but im starting to get into doing the terrain park at my mountain but im looking for a new board and want it to be light and flexible and just a good terrain park freeride board with a wide stance. i ride a 146 now and it is pretty small but i dont want my next board to be really big. so wut would be a good size?