To the OP, go and demo some boats. A lot of boats. Demo them multiple times. Nobody here can tell you what boat to buy. No offence to anybody here, but on a forum you cannot tell what kind of experience or skill people have when they recommend a boat, or when they say they disliked a boat.
A lot of top guys use a Mamba, but I'm not so keen on it. My weight is in the wrong place and none of them suit me well. The Stomper is a bit of a love/hate for some people, but even though I am 5'8 and 63kg I loved the Stomper 80. Others find it to be a tank or just plain don't like it. A Zet Raptor or Veloc will suit people who really drive the boat (as will the Stomper), but won't reward drifting. It depends how you paddle.
First you need to be comfortable in the boat. It needs to "feel" the right size, even if that takes some padding (some buy a boat too small). But then it needs to feel right on the water. Some like sportier feeling boats, others like boats that feel more progressive. Some like edges, others like the hull to be rounded more.
If you are new to kayaking, personally I would say to buy a cheap used boat that'll get you down most stuff, and then have a go in other peoples boats to find out what you like. Yep, buying a boat is kind of like finding a wife/long term girlfriend! Umm, not that I am suggesting having an affair you understand. Lets call it a loose analogy! Just that it is a waste of money to buy a new boat when you don't know what you like or haven't developed a style yet. A new boat loses 50% of its value the moment it leaves the showroom.