What kind of kayak should i buy?

I agree that for fishing you want an SOT (sit-on-top). I also agree that you should avoid inflatables. I will add one thing--if at all possible, demo the boat before you buy it! A friend of mine bought an SOT without taking it out first, and he was in a lot of discomfort because it just didn't suit him. He could barely walk after getting out! Kayaks differ from brand to brand. At the very least, sit in it first.