I don't know how much help I can be seeing as I don't have either however coming from a fellow pullip,teayang love of big eyes and headed dolls person I decided to put my two cents in seeing as I was in the same position as you and lately I also liked the idea of a hujoo berry
Jumping into a bigger doll then what your used to can be a little intimidating however I would suggest saving for the BJD then after getting her decide if you want the hujoo berry also beware of ebay I suggest if you live in the states to buy from a distributer such as http://www.denverdoll.com/dimdoll.php denver doll since they are a well known and trusted distributer (although I have never done business with them as of yet I do plan to point is I have no experience with them personally ) and unless you have to avoid ebay unless it's the actually D.I.M company then thats ok
Also just a note unless you haven't already I would suggest looking and comparison photos of a pullip/teayang/dal next to whatever size BJD you plan on getting just to give you an idea of how it will be and get you used to the size difference if there is any