Hi J.,
I decided to go with the tubal ligation after having our second via C section. I figured, "hey, while you are in there...", rather than make him go through the pain. While it was the most convienient, for many reasons, I have serious regrets. Not about having eliminated our chances at increasing our family... that I am / we are confident about. However, I didn't realize that tubal ligation can lead to extremely heavy periods, which, of course, I ended up with. My obgyn has now recommended partial hysterectomy (removal of just the uterus) to remedy my otherwise unstoppable heavy monthlies and incredible lower pelvic pain. I didn't research the tubal before having it done (didn't even know there could be side effects!). If nothing else, be well read and prepared to discuss, openly, your options (and there side effects / risks /etc) with your obygn. If you are comfortable with it, have hubby present so he understands that there are risks involved for you too.
BTW, I totally agree with your assessment -- let him go through one unpleasant week or so! Heck, you and your body have been through hell for 27 months, not counting post partum! It's his turn! :)
All kidding aside, this is a family decision, true, but at the end of the day, it is still your body. Make sure that you are comfortable with whatever decision you reach. If, by the time you have your son, you still don't have a "long term" plan decided upon, there are a multitude "short term" options to cover you until you find the right solution for you.
Good luck!