DH and I are vegetarian and raise DS in the same way. I think someone summed it up perfectly - a balanced diet is a balanced diet whether you are vegetarian or not.
There are many great reasons to be vegie but don't be surprised if your DH takes a while to come to the party. I would consult a good dietician who knows about veggie diets. I have one up here who does consults by email so pm me if you would like her details. She is vegan and raised three kids that way as well.
Good luck!