Out of the choices in your list, I picked Hindi. The culture fascinates me. Bengali might be interesting.
I have always secretly wanted to learn Gaelic. If I could have picked my country of origin, it would have been Ireland.
I did very well in Spanish classes during high school. I have lost most of my vocabulary but I retained most of the grammatical rules. I could skate by if I absolutely had to do so. I had considered French classes instead of Spanish in school but I was annoyed with all of the dropped sounds in speech.