I'm tempted to say, start over as a 6 year-old - this would have to include me going back in time, or the deal's off. To be able to re-live that time would be priceless. Sounds like a movie starring Nicholas Cage, or produced by Hallmark.
But - how difficult would it be to make the changes I want or correct the mistakes I want, and still keep my timeline intact so that I marry the same woman and have the same children? And what about time travel/Back To The Future paradoxes???
On second thought, gimme the 10 mil. Keep it simple.