I would just keep the DTV visa. You will only get a single entry non immigrant O from any embassy or consulate. You can then go to immigration and get a year extension if you have money seasoned in a bank for 3 months. They will also want pictures of you and your wife standing in front of your residence showing the house number, sitting on the end of your bed and a bunch of other weird photos . They want a map drawn by hand to your house a Google map print out isn't good enough. They will also come visit you at your house. You have a 5 year visa that gives you 180 days on arrival why mess with a good thing. I get marriage Visa's and I'm planning on getting a DTV visa because it's less headache.
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