Another longer approach route is the western Shira Plateau which has a very high success rate. I did it in 1994. You end up camping in the inner crater, 18,800' + or - and get up at a leisurely hour for breakfast and leave around 8 am for the final easy push for the summit. You descend on one of the "normal" ascent routes and spend one last night down at a lower elevation before exiting.
