The reasons I had my son circumcised:
1. The difference factor. It would be less so now, since this is more of an option than when I had him. But I feared him being 'different' and how i'd explain it.
2. My very good friend's son had his foreskin shrink and he refused to use the bathroom to potty because pulling back the foreskin hurt. He had to soak in a warm tub before using the bathroom. It was awful.
3. A good male friend of mine was uncirced until he was a teenager. Due to an infection he had to have it done and he said it was terribly painful - especially having sex afterwards. He did, in fact rip it open and it was an excrutiating 'fix'.
4. My mom is a nurse in the emergency room and has seen many men come in from nursing homes who have to have it done due to hygeine issues.
I'm not saying it is the right or wrong choice. I may make a different decision if/when I have another boy. But that was why I made the decision I made.