I'm going to face a tough decision some day, assuming I have any boys. Circumcision strikes me as not only absurd but kind of barbaric. It doesn't rise to true barbarism like female genital mutilation because there's no serious harm caused and it actually has some minor health benefits, but you're still cutting off part of a baby's penis for no good reason.
Why a tough decision? I'm not sure. Mostly because I suspect my parents would be devastated to a degree not matched by my leaving of Orthodoxy. It would be more along the lines of me converting to Christianity or marrying a non-Jew. But I can't see myself having my son's penis cut just to please my parents. Anyway, we'll see. I have to get married first. :-)
Circumcision is one of those things that really brings home the fact that Judaism was originated by a bunch of primitives thousands of years ago.