DON"T DO IT!
I was assigned to do an article on this a couple of years ago. Hair transplants will never give you a full head of hair and will become very apparent as you recede further. In some cases it may work (especially with curly hair) but more often than not, it looks like shit and leaves you scarred.
Minoxidol doesn't do shit either.
You have two options: Either keep your hair really short, or shaved. Or invest in a good piece -- the kind movie stars wear, not the kind your Uncle Fred wears. Expect to pay $1000 twice a year. (Minimum). Nothing's worse than a bargain hair piece.