What qualities do you admire about your typological opposite? There will be no bitching about ESFJs et. al in this thread. If you can't say anything nice, don't say anything at all.
The only ISTP I know very well is my sister. I don't know how many things I appreciate about her are type-related. I like how she's very laid back about most things and is way less combustible than me. She's always saying these wry little statements that keeps everyone in stitches. In some ways, she's more patient with people than I am and more accepting of who they are, without trying to change them. I also find her to be industrious and clever, able to spin situations to her advantage very quickly, when I'm still trying to figure out the what the hell just happened.