I just went through this decision making process last week and bought the 67 in. Senate Graphite. I usually free ski at 34, -28. In the course 31-32 mph, mostly 15 off, 66 yr and190 to 195. So far the ski turns great and is really easy to deep water start. My face doesn't even get wet! No more agonizing about the 69 in. Had a PP mistake Sunday and skied 36 mph in rough open water, 28 off and the ski turned surprisingly well- just need to get forward in the glide.