Metric, I think it really depends on your riding style. If you like to ride a healthy amount of park/freestyle etc, I'd go 154. If you like bigger mountain, faster, off piste, I'd go 157. To give you an idea...I'm 5'10 155 and going to get the 152. I have a good friend (another instructor) who is 200 lbs and loves the 157 cm.
For me, when I rode the 157 I loved it for fast carving, steeps, and jumps...but i couldn't press or butter it well at all. I think at your size either the 154 or 157 will work out great...you just have to be honest with yourself about what kind of riding you enjoy the most, and that will make your decision for you. hope it helps!