This is a little off-topic, and if you want to discuss it with me privately or in e-mail that’s fine.
For me personally, I’m a Protestant but open to the truths of the East and West Catholic traditions.
However, my biggest hang-ups (off the top of my head) would be: Papacy (even though I really like Benedict, and am reading “Intro. to Christianity” right now, and loved his encyclical Spe Salvi), Marian devotion, Merit and works of supererogation, Transsubstantiation (although I hold to real presence), the Catholic view of Tradition, and veneration of objects/saints, etc.