How many Darth Banes does it take to kill...

Round 1: post-Sirak fight Bane
Round 2: PoD Bane
Round 3: RoT Bane
Round 4: DoE Bane
Round 5: Neph/Nebaris/DMB Bane

Force
Sabers
All-out

1. Agen Kolar
2. Qui Gon
3. Darth Zannah
4. Marka Ragnos
5. Freedon Nadd
6. Scourge
7. Obi Wan
8. Kyle Katarn
9. Darth Malgus
10. Darth Jadus
11. Count Dooku
12. Anakin Skywalker
13. Exar Kun
14. Revan
15. Darth Vader
16. Darth Krayt
17. Revan Vitiate
18. Dark Empire Luke
19. Darth Caedus
20. Palpatine
21. Luke Skywalker
22. Abeloth
23. The Daughter

Agen kolar is far uglier than Bane, so I don't think even 1000 Bane would beat him. Nep's Bane is beatiful, however, and 1 Bane would stomp everyone except the Daughter, maybe.

RoT Bane:

1. Agen Kolar - 1
2. Qui Gon -1
3. Darth Zannah - 1
4. Marka Ragnos - 1
5. Freedon Nadd - 1
6. Scourge - 1
7. Obi Wan -1
8. Kyle Katarn - 1
9. Darth Malgus - 1 or 2
10. Darth Jadus - 3
11. Count Dooku - 3
12. Anakin Skywalker - 2 or 3
13. Exar Kun - 3
14. Revan - 4
15. Darth Vader - 4
16. Darth Krayt - 5
17. Revan Vitiate - 10
18. Dark Empire Luke - 6
19. Darth Caedus - 7
20. Palpatine - 15
21. Luke Skywalker - 3 or infinite depending on consistency
22. Abeloth - 30+
23. The Daughter - incalculable

3 Orbalisk Banes to kill Jadus/Dooku/Anakin/Kun? Damn.

Assuming R4...

1. Agen Kolar
2. Qui Gon
3. Darth Zannah

1.

4. Marka Ragnos
5. Freedon Nadd

1-2.

6. Scourge
8. Kyle Katarn

1.

7. Obi Wan
9. Darth Malgus
10. Darth Jadus
11. Count Dooku

1-2.

12. Anakin Skywalker
13. Exar Kun
14. Revan
15. Darth Vader
16. Darth Krayt

2.

17. Revan Vitiate

2-3

18. Dark Empire Luke
19. Darth Caedus

2.

20. Palpatine
21. Luke Skywalker

3.

22. Abeloth
23. The Daughter

A lot more than 3.

^ I don't think 2 or 3 Obi Wans could take down Luke/Palpatine/Caedus, seeing what Palpatine did to the B-team and how Dooku manhandled an Obi Wan being backed by Anakin.