My dolls chose their size at first. LOL! I ended up starting with an SD boy and then got one of the bigger 70cm+ because he was cute! At first I thought I would have to keep an eye on proportion and how the dolls matched into the 'family', but now I'm willing to try different looks. My SD Dragon Doll girl will look more like a fantasy doll next to a planned SD Iplehouse Girl. Last September, I wouldn't have even considered that. For my size range preference, I like the bigger dolls because I sew, and there's more room to work with design details on clothing for the bigger dolls. I think after a while, it's just a matter of what doll looks so cute you can't live without it and end up buying what ever size it is. I love the little bitties, they are getting more and more cute! But I can't justify getting one of them. I moved to BJDs to get away from the too small (for me) 1/6 dolls.