[color=#000000]This is xfaderx (formerly of ChaosCore/ChaosKnights - the only clan i ever joined, and probably ever will join)
I know you want this list in order of who was best in particular years/months, but I prefer to do it by characters.
Now the fact that I live in Australia made it harder for me to be on at the same time as a lot of the greater fighters, but I've definitely had my share of good fights, as well as dishing out plenty of cans of whoop-ass in my time
Apologies to those who are great fighters who don't appear below, it is most likely due to the fact that our paths haven't crossed thus far.
cyc|ops
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The only stand out here is TJ5. He was the only person to ever play me and play bloody good using Cyc and not be a total cheap-ass. Kudos to you TJ5
Sentinel
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A few names spring to mind here... Chicken Wing, Maori_Legend, dark-link and Pip99 (when he isn't complaining about lag).
sp