Yup, my moneys on D. sexfasciatus (not a headstander). Grow huge, upto a metre in the wild aparently and no probs to reach 2.5 feett in captivity. Can be pretty aggressive too.
They are not a headstander and as stated are from Africa. They are pretty common too. D. lelusso is more rare and looks just like a sexfaciatus except it has a longer snout. My LFS has a 14" D. lelusso for $60.