I am looking for advice on the length of my first kayak. I have rented several of varying lengths for lakes and slow moving rivers and found I like a boat that is swift and tracks well. I don't weigh much and have a lot of upper body strength for my size so I am comfortable pushing a longer boat around to turn. I am considering the WS Tsunami, Tempest, or Focus and I think I want a boat that is at least 14 feet in length for the speed and tracking, but I'm torn between a 14-14.5 foot model or 16-16.5 foot model. I'll be mostly day tripping at this point. Thoughts from experienced touring kayakers would be appreciated.