Exar Kun vs. Darth Maul
This may have already been done, but anyway, the duel of the double-sided lightsabers. I say Exar Kun, even though Maul was trained by sidious, and killed Qui-Gon, one of the greatest Jedi ever.
Also, why does everyone say NJO Luke, or ROTJ Luke, or ESB Luke, or ROTS Anakin, ROTS obi-wan? how about we just start saying "Luke" "Anakin" or "obi-wan" and assume it's when they're at their prime?