definitely no bigger than a Medium. at your height/weight i'd say they'll look slim-ish like mine without being nuthuggingly tight.
my only complaints about the Holdens is the snow gaiter doesn't fit over your boot worth a shit (too small), but i just cut it out and sewed it up and haven't had a problem. also it looks kinda funny when the zippers are zipped shut around the ankles, so i just always ride with them open.