I have four.
INTJ (female)- I have NEVER had an instant mind-meld with any other type the way I have with INTJs, and this one in particular. She brings logic to my flailing, and adds more intense scrutiny to the things I process out loud to her. She focuses my processing and challenges the hell out of me in the best way. She knows the right things to say to an XTJ in emotional distress. Very loving in a stoic, constant way. Apt to express her affection in nonverbal ways. Loyal and trustworthy as all hell. I am honored that she trusts ME.
INTP (male)- The smartest person I've ever met. His P-preference mellows out my infinite J-ness, so he re-centers me when I get too far into TJ land. His less-focused, introverted qualities cause me to slow down and just BE, but also challenge me to think about possibilities and ideas I'd never considered. We talk about big issues in great detail and with great wonder. He out-T's me, but he's also very nurturing and insightful.
INFP (female)- The most nurturing, loving person I know. I think I might have finally grown up enough to be able to meet her halfway (or at least a quarter of the way) when it comes to F-ness. I've never been so comfortable being emotional and completely honest with anyone, since I feel unconditionally accepted with her. There is no judgment or bullshit in our friendship, and it's refreshing. She has more patience (at least outwardly) than I can fathom. I'm always amazed that she doesn't find other people's emotions to be extremely draining the way I do. She shows me that it's OK to dream. She overflows with depth, sincerity, and idealism, and I love it!
ISTJ (female)- The most responsible person I know. She out-anal-retentives me, but we're comfortable enough to call each other on our anal-retentiveness and over-thinking-ness. We share not only a history, but a sense of humor. She understands about my tendencies towards being independent and intellectually focused.