Hblair, if you are considering that, I would ask you to think on why you're doing that.
If its because you dont want more children, you and your wife should also look into another procedure, I dont remember the name of it, but it is done on the woman's fallopian tubes. This procedure is COMPLETELY reversible if you and your lady want to have a kid later on.
OTH, giving you the *snip* is not reversible.
But again, that all depends on your motivation to do it. Personally, I prefer to have the option of "restoring" (lol.. load saved game...) anything later on if it didnt turn out to be such a good idea.