Like you I was 200lbs and 6 ft tall about a year ago, if you felt rather chubby you must have felt like I did at that weight. I am now running about 160 give or take a couple of lbs and it feel about right, will probably weigh about 155 this summer. I am rather skinny though, if you are more of the "brawny" type the 170 might be perfect for you.