My choice would be a Solstice GT in Kevlar from Current Design. I am 6' and 215-220. Stable, good in rough, nice speed, good storage. Superb workmanship and lifetime warranty. Long time to grow out of it if ever. Wide base seat may be an option you want. Solstice is a boat I was in and confident in 5 minutes as far a tippy goes and it was the first sit in kayak I was in. I now have a CD Nomad which feels great too. It felt tippy but now after spending 4-5 hours in one I restored it feels near the same as the Solstice. First itme in it I was exhausted after 40 minutes as it felt tippy. Solstice is the most popular composite boat in the world. Available in a poly version but heavier if you are transporting it a lot. Demo paddle a boat for at least an hour or more preferably in different type water but that is hard to do. Reviews are good on paddling.net on the Solstice. I have a Solstice like that and love it. Nice leg room and feet room. I rented some CD boats outside their Solstice style and didn't like them for comfort nearly as much. Also a known boat and easy to sell. http://www.cdkayak.com/products/template...46d9344ae0fdc9f
I personally like a rudder in real rough water and high winds over 20 knots. I was new to the sport last July. Few lessons, read 6-7 books. 10 videos or more. I have tons to learn but feel I have progress at a good pace.