I personally cannot handle anything larger than a YoSD (26 cm). The smallest size I can accept is 11 cm (pukipuki size). I have a 10 cm DD-Anne doll, but she seems to be too small for me to bond. Overall I prefer Lati Yellow size (16 cm). Perfect size for me :-) After all, it depends on what you prefer. I like my dolls to be small to be carried around easily. But I cannot fumble on anything that is below 11 cm, otherwise my fingers knot ^^.
Well I have a puki which is 11cm, and she was my first BJD, but my other dolls (not BJDs) were much taller, so it was kinda funny at the start. But I love it being so tiny, it opens up a whole new world of photography. 19cm isn't really small in my book now :P So I think it'll be ok, tiny is cute anyway!!
I love anything really tiny so my biggest BJdoll is a Lati yellowsp but I would not rule out a teeny tiny like Sqee by Dream High, who is the smallest I have ever seen! my favourite size is definately Lati white SP, perfect for me.