My first BJD was the MSD size and was Aidan from Dollmore. She was a great starter doll and I was very happy with her until my first SD size arrived...then I KNEW what I wanted! Aidan found a new home and I haven't looked back since. I did try the smaller size, but found I didn't enjoy them nearly as much. Eventually, I'd like to get one around 10" again, to take on trips, etc., but for now, I am very content with my collection.
My personal favs are the Elfdoll girls. I have 3 - two Nabee's and one Soah. Also have my 57cm Narae who is my siggy girl. (I don't know why they call them 60 cm Narae's because they are only 57 cm tall...) She is the french resin and requires a little more special care and handling as the resin has a tendency to yellow over time. But the look and feel of french resin in unsurpassed! So glowy and luminous! My 2 boys are Latidoll Aida and Angel of Dream Ming.
The best advice someone gave me was to buy a face that you absolutely LOVE! If you don't find one right away...keep looking. There is such a variance in styles of the BJD's that you are bound to find yours if you keep looking. Den of Angels is a good online doll forum, but is huge and cen be very overwhelming. Take your time and explore the different websites and companies...you'll find what you're looking for!
Good luck and please let us know who you choose in the end!
Mary