This is really a decision best made by talking through it with your DH. I am fairly anti-circumcision but DH is Jewish and has strong feelings about it. I typically research everything, but in this case I didn't want to catch DH off guard by being prepared with a ton of info and springing the conversation on him. I told him a few days in advance i wanted to discuss it and to let me know when he was ready.
Personally, I can't find any justification for doing it. The APA has revised their stance and is supposed to issue a more thorough position on it sometime in the near future. I'm not swayed by the locker room stuff, my brother is not circumcised and said it was never an issue for him and it didn't affect his relationships with women. In our case, DH feels strongly that his son look like him and look like other Jewish men, even though DH is not very religious. I didn't realize how big a deal it was to him until we spoke.
At this point I'm resigned to having it done because it means a lot to DH. That said, even if you aren't Jewish, I found this thread the most helpful of the archived circumcision threads on DCUM
http://www.dcurbanmom.com/jforum/posts/list/42036.page
Good luck, it's definitely a tough decision.