People make a big deal of the duels in the Prequel Trilogy being all ridiculous flashiness but SW never had good "technical dueling." If you watch Luke against Vader in Return of the Jedi he sword duels like he's waving around a baseball bat.
For all the crap people give Hayden about his portrayal of Anakin, I thougth he was picture perfect at the climax of ROTS and his duel with Obi-Wan is thus my favorite.
Stuff like the fact the battle was not at all speed up - the actors were just going at each other with that much intensity. Then there were other little things that were just great at setting the mood, like around 2:15 when Anakin gives that kick to knock Obi-Wan back and then there's just a shot of him kinda angrily strutting forward to continue fighting. The part with him choking Obi-Wan was great too for showing how vicious he was being.
Of course we must not neglect Darth Maul aka Ray Park. The double-bladed lightsaber is a way cooler weapon.