[BuckSkin]

For a family man, if you do decide to join the military, the USAF would be more beneficial. Their tours of duty in combat theaters of operation are half as long as the Army's. I've watched two AF units come and go during my current deployment and realized I may have made the wrong decision years ago (I'm Army).
A lot of good advice from the guys here, but I will put one caveat to what That Guy said. It has become increasingly more difficult to transfer from National Guard to an active component, and with budget cutbacks it will only get tougher. You will need the buy in from your wife, because as always it's "you and she versus the world".