I'm in the market for a poly touring kayak in the 15-17 foot range, to use on extended river trips. I've got a Tsunami 125, and have done 5 day solo trips fairly easily. I am 6' 165#, the Tsunami 125 is plenty big if not maybe a little too roomy in the cockpit. None-the-less, the 125 has been a very good boat, and I'm interested in staying in the Tsunami family as I go to a greater length. It appears the half-sizes (155,165,175) are more accommodating to larger paddlers. I guess I'm curious if anyone has an opinion to which Tsunami might be my best choice? would I fit better in a 160 or 170?