I don't feel I've had enough experience with the types to really answer this effectively, especially since I've only met ANY N's very recently, and very few T's. But based on such..
Friend-wise I tend to really get along with ISFPs. They're so agreeable and just.. down-to-earth, honest-to-goodness sweet. Not overly nice or anything, just accepting and kind. That mixed with their creativity makes me feel totally comfortable being whatever part of my multi-faceted INFJ-ness I choose to be at the moment no matter if it's quiet and hard-working, philosophical and idealistic, melancholy and downtrodden, or totally random and silly. I also tend to develop a beautiful idea-bouncing bond with them. They share their ideas/art with me, which I then find meanings in and become inspired from, which then gives them a new perspective and/or inspires them in return to make more art. (And this isn't to say that all ISFPs ARE artists, or that other types aren't.. just the two I know definitely are.)
Attractive-wise I'm desperately drawn towards E_F_s. I really admire the sweeping connections they can form with many people which my introversion just won't allow. I want to just latch onto them and keep them happy so they can continue to make other people happy, which then creates a big swelling of positive energy that I can thrive in. (Our very own PinkP is a perfect example of this! Er.. perhaps I should clarify..in a platonic sense with females, but it still stirs excitement within me!)
Lately I've also developed some nice debate/conversation buddies in INTPs as well. I read somewhere that INFJs and INTPs don't usually get along, but when both are respectful and open minded, I don't see a problem. Their drive to understand compliments my drive to apply really well and leads to some heated, but useful discussions. More than once they've given me some rather objective views into my own behavior, which can be frustrating, but keeps me thinking and grounded. (Another example from the board would be Cyber. We had a nice discussion in the chatroom awhile back. )
I'd really like to meet an ENTP in real life, as several people on here have stated that they and INFJs tend to get along really well.