im a very strong and athletic skiier, 5'11'' and 168lbs, looking to start park this season. my choices are K2 EXT in 169 or 179 or K2 disorderlys in 179? What are the difference in the two skis, where im getting them they are the same price, so what is the better ski?will 179 be too long for a part specific ski? will center mount with either rossi freeski 110s, sth 12s or , most likely, griffins. thanks for the help.