What's your skill level? I have several buddies around your weight range and shorter than you, but still ride 158's for their all mountain boards. They're rippers though. Since you're still growing, which probably means more weight and larger shoe size, then get the 158 so you don't outgrow before next season.
18 Rossignol Sushi . 17 Arbor Terrapin . 17 Lib x Lost Mayhem Short Fat . 17 Capita Spring Break Slush Slasher . 16 Never Summer Swift . 14 TJ Brand Retro Fish
17 Union Ultra . 17 Rome Katana . 17 Burton Malavita Wing . 16 Burton Genesis X
16 Flow Talon