Sounds like a "river runner" kayak would be a good choice for you.
CKS| River Running Kayaks: Liquid Logic Remix, Pyranha Ammo, Wavesport Diesel & more
They are easier to learn in, and are more forgiving for river running in general. I am the exact same size as you, and like to paddle river running boats in the 80 gallon range. 80-90 gallons seems to work for me. The more "volume" in a boat, the higher it sits out of the water, the less it is effected by river features, and the more comfortable you are. The Pyranha Karnali seems to fit me well and is good for my needs.It is fast, stable and can punch through meaty features well due to the speed that it can generate. The Liquid Logic Remix (79) is another good boat - awesome outfitting and very forgiving, fast and predictable. The WaveSport Diesel 80, and Jackson Super Hero are good choices too. They would all get the job done - and then some.
Oil canning is when the hull of a boat begins to divot. Small oil can spots may not effect the performance of a boat. Larger oil cans can begin to negatively effect the way a boat paddles.
Here is a blog review that addresses a few of the questions that you asked:
So you want to go Creekin'? - Colorado Kayak Supply BlogColorado Kayak Supply Blog
Hope that helps.