Galen Marek vs The Lich King Ner'zhul
Marek can use all his Force powers at their fullest strength and so can the Lich King. Marek is armed with 2 lightsabers as in the trailer for TFU2 and his showing in said trailer will be used as canon as well as actual canon. Though if you feel thats unfair then say so and I may reconsider. The Lich King is armed only with Frostmorne and the feats from his universe.
They fight in the Tomb of Ragnos from the excellent Jedi Knight series.