Hmm, who's the most selfish of the NFs? NFs seem way too self-effacing for my tastes. We love them because of their generosity, but I wouldn't want to be one of those people who's constantly questioning themself and giving, giving, giving. Selfish, huh?
INFJ would be my choice, I guess.
My strong introverted intuition is very important to me, and I think I could have a lot of fun being an INFJ--people would probably be less afraid of me...
And, I'm not trying to be rude, but I don't think I could stand being an INFP. They're nice people, and I have many friends/family members among them, but I think it would be waaaay too exhausting to be one. All that inner turmoil and self-loathing, dwelling on things from the past--I just couldn't cope (and I wouldn't want to).