Just get Revenge of the Sith for your PS2/Xbox and play the Duel modes. It's THE BEST lightsaber battles, unless you consider the "jousting" in Jedi Knight or the turn-based dial-a-battle in KOTOR lightsaber battles.
Both of those games are great, but for pure Soul Caliber-style lightsabers, my money's on ROTS. If it only had more characters and was Live enabled!!!