Frankly I'd write it into my will that my organs can be taken from my body after death, but only if they're needed by members of my family, or by friends.
Call it horrible, call it evil, call it what you want, but honestly, the only people I really value all that much are my family and friends and if my organs save the people I love and care for, then yay, I die happy.
I know damn well I'll probably be yelled at or what have you for that stance, but fuck it, I really couldn't care less, that's my choice and I'm sticking to it. Maybe my attitude will change in a few years and maybe that'll prompt me to sign up to the organ donation registry, I don't know. But until that time comes, that's my choice.