Hmm...I'm another one who wouldn't donate. I feel selfish but I can't change it. My DH and I have both talked about it too, he would donate, he really doesn't care. I feel the same as your DH, I don't know if I will need it in the next life. The bible says that we will be 'resurrected' like Jesus and I'm not really sure how that works. Jesus didn't leave a body, it rose with him to heaven. So doesn't that mean I need it?? I don't know. That's part of my decision, and also the fact that I just can't stand the thought of it so it would make my grief much worse, like others have said. I would also have a lot of trouble donating DH's organs if I had to, I feel that it would worry me so much, give me nightmares, and I just couldn't stand the thought of it. DH says that that is fine and I wouldn't have to do it for him it would be my choice because he doesn't have strong feelings either way. I would not be cremated either.
So I can really understand your DH's point of view. Like someone else said it seems pretty unlikely you would have to choose anyway because not many people actually get to donate, but it's great you've discussed it.