im 6'1", 195#, 12 boot, and i ride a 161 all mountain board. you might wanna look a little smaller.
should you buy or not?... that's entirely up to you. do you think you'll get a lot of use out of it if you do buy it? personally i think if you did buy it, it would motivate you to go more. i bought my stuff before ever riding and i got completely addicted after an hour or two. now is definitely the time to buy if you're gonna, but it's entirely up to you.
i have ride bindings and i love them; ride and atomic both make great boards, havoc is stiffer than a decade meaning less forgiving for someone new, both are nice tho. don't really know anything about cold smoke, except the graphics are sweet.