M.H.
Let me start by saying that I have no personal experience with this, I'm just saying what I THINK I would do in your situation. It sounds like you found a great guy and I am very happy for you! We all deserve happyness and love! Since you have a son involved, I persoanlly feel 6 months is WAY too soon. You can't truely say you know him yet and if you go through a move and a break up, you are dragging your son into it too. Why the rush?? You can stay over a night or two and date happily for a year or two more.
I hate to be the most unromantic person in the world here, but have you done a background check on him? This is one of the first things I would do if I had to start dating again and was getting serious with someone. You have a son and your top job is keeping him safe. I can't stand all the news stories of kids that dissapear and/or have bad things happen to them by their mom's boyfriend! They always have records and the mom just doesn't take the time to find out about them.
sorry to bring up a bad subject, but it is important. I say to take it easy for your son's sake. You don't have to move in together to be happy and in love! If he is really such a great guy, he will understand your priorities.
Again, I am very happy for you and I hope things work out for the three of you!