Ocone makes a nice Falanghina that is well priced.
Cantine Farro (with the "Le Cigliate") and La Sibilla make perhaps the most interesting 100% Falanghinas I have come across. Both are from the Campi Flegrei, which is probably not a coincidence.
There are some Falanghina / Biancolella blends out there that I also like.