1) Juubito
2) Current Madara
3) Hashirama
4) Orochimaru - edo Tobirama, edo BM Minato, edo Hiruzen. BM Minato is the key here - weaker than Hashi and Madara because mokuton clones can deal with edos.
5) Kabuto - edo Nagato, edo Kage etc - Weaker than Orochimaru mainly because of BM...