Round 1: Sabers only
1. Darth Vader - eh, dunno. Vader knows what his prievous self is going to do pretty much perfectly. He will be able to perfectly predict every single movement, know Anakin's every plan, tactic and reaction ahead of time. Anakin in this state is far better than RotJ Vader as individual combatant, but it would need to be a far greater disparity.
2. Exar Kun - he definitely wins, good fight, but Kun stands no chance at actually wining this.
3. Darth Krayt - Anakin wins in a great fight.
4. Darth Caedus - probably Caedus in a tremendous fight, but I can understand people going with Anakin.
5. Darth Plagueis - same as above.
6. Yoda - Yoda in a tremendous fight, but this time I don't see Anakin as a plausible option.
7. RotJ Sidious - same.
8. DE Sidious - same.
9. DN Luke - same.
10. Oneness Jacen Solo - by the nature of the Force Jacen should be literally unable to lose in this state unless facing entities.
Round 2: All-out, 10 meters starting distance
1. Darth Vader - pretty much what I've already stated. Anakin is more powerful, but his power channels into the natural basic amplification, as Anakin he really isn't a refined telekinetic, so adding in Force changes little.
2. Exar Kun - he should still win, but Sorcery targeting Anakin's mind can be a game changer given his lack of mental stability, however on the other hand... does Kun really have a good chance of getting a time to really draw on his Sorcery? I severely doubt that.
3. Darth Krayt - this one can go either way. Krayt's dark transfer, unknown to Anakin, can be a wildcard, and Krayt's Force power can prevent Anakin from overpowering him in saber combat (and Anakin would definitely win the saber duel in the end).
4. Darth Caedus - Caedus in a tremendous fight for me, but it's debatable.
5. Darth Plagueis - nearly same as above, but Plagueis has a higher shot given a plethora of abilities unknown to Anakin, and being clearly more powerful than Caedus or Anakin. Enraged Anakin's game is saber combat, Plagueis has the luck of having other options than just outdueling Anakin.
6. Yoda - tremendous fight actually, but Anakin definitely can't win for me, even though it would be a grueling fight at the very least.
7. RotJ Palpatine - as above.
8. DE Palpatine - no chance for Anakin, really, at all.
9. DN Luke Skywalker - same as above. No contest.
10. Jacen Solo - per round 1.