im 6' 175lbs. very agressive skier on the east coast. looking at 08 Seths for next year. gonna use em for 60% all mtn 40% park. no pipe. i know K2 runs like 2 or 3 cm larger than they say, so what do you guys think, 179 or 189 for me? probably gonna center mount. (dont try and convinve me not to. i know what im doing) thanks!