Sup everyone..As the season starts to get closer and as I look online and see new 2009 boards I get that itchy feeling..No not that one

so im looking to buy a new board this season, I now ride 155 both park board's GNU/Burton. As was looking into getting another freestyle park board , but this one will be more for mountain riding with and ocassional jib here and there. So I was thinking on getting something bigger like 156-158, what do you guy's think good idea? Or just stay with the 155 range I ride now. Note im 190lbs 5'8" and have no problem riding 155, I was just thinking to get something a slight bigger for more control on day's I just wanna chill and ride.