Hello - Golden Horse told me to take a look.
The one that jumps out at me is Wall Street NTF. He has always caught my eye - a beautiful stallion (now gelding) that is well balanced but still has good amount of bone. I believe he was an Austrian import. I believe his son - Windsor NTF - who is also on the pedigree - was owned by Braircroft Haflingers at one point, the person who runs the haflingerfriends list on yahoo groups. Might want to ask her for more info. Emily is friendly and usually willing to answer questions.
Arno - well he is a big name and high-ranking. Really caters to the "modern" tastes in haflingers for those who prefer that. Not my cup of tea, but that is because I prefer the stouter haflingers with more bone than he has. However - he has excellent conformation and movement and your filly should be an excellent mover if she has inherited anything from him.