We're going with condoms here. Last time we did sort of a mix of condoms and loosey goosey NFP - basically, we chanced it when I figured we were safe. It's funny, even thought it's pretty reliable, I wouldn't chance it this time...we do want to have one more, but I want to space them about the same in case Declan weans during pregnancy like Fionn did (well, really I set limits that encouraged weaning). That way I'm sure he gets at least two years of booby milk. That consideration wasn't even a blip on my radar last time around!! So it's condoms full-time for two years. I am not fussy on the idea of an IUD and the diaphragm sounds like more of a pain than condoms.
Follow Mothering