Jedi Knight and Mysteries of the Sith. Especially with the Saber Battle X mods (JK | MotS). It's mostly meant for multiplayer, but it's worth it in SP just for the awesome looking Sabers.

Really liked the two Battlefront games, too.

Wanted to like Dark Forces, but it just makes me motion sick, and it's really hard to go back to 320 resolution these days (and I couldn't get any emulators to run the Mac version at full speed). Wanted to like Jedi Outcast, but the AI was terrible =/

Always wanted to try Bounty Hunter, but haven't had the chance yet.