If you are going to go for the artsy I'd go for the GM. I heard the strap is a bit longer, so the purse is easier to fold over and doesn't sit right under your armpit LOL! I saw some pics of a GM reveal and I believe the woman was around 5'4" or around that, and it looked great on her, didn't look too big at all. I'm 5'7" and want to get the artsy in the Gm as well, I LOVE big bags. If you decide to get the galliera i'd go for the gm size, it sounds like you know that's the one you want, and if you like larger bags, i'd go for it. I think most people can wear most styles as long as they love it and are comfortable with it, that love my bag vibe comes accross and then the bag always seems to look great! Good Luck with your decision, be sure to do a reveal when you decide!