The very best Captain Marvel/Shazam is the Alex Ross figure series. http://www.figurerealm.com/actionfigure.php?FID=23308
His head is perfect. That go to saying, who has the perfect head for you and EVERYTHING else will pale to it! I just looked him up on ebay and he runs about 70 bucks! I don't have a clue who I would use. Perhaps you have a small chance in getting a copy of his head. Good luck!