A few things:
-Get something that fit's.Something that you will be able to roll in the future without falling out of or equiping with 10lbs of padding.
-Go for something with two bulkheads.
-Go to an outfitter that allows you to rent kayaks with the money going towards purchase. I know trailhead in Ottawa allowed me to pick any boat I wanted to try for the day, bring it back and my rental went towards purchase.
-Dont buy a big box store brand of crappy kayak. You will enjoy it until you meet up with someone who has a good kayak.Then you'll regret saving 300 dollars on a piece of _______.