I'd say go for Jedi Knight 2: Outcast, it's story wise lightyears ahead of Academy, feels more Star Wars-ish, has awesome cutscenes ( approach to Bespin anyone? ) and Kyle Katarn.
Academy in comparison, has a average Story despite visiting known locations like echo base and Tatooine.
The lightsaber fights are more interessting though( in MP at least, once you figured out the moves, the Bossfights are rather easy).
Some levels are just awesome, imo, like Chandrila.
Academy isn't a bad game by all means, it's just doesn't feel fleshed out like Outcast does.
If you are a fan of the movies ( including the prequels) The Moviebattles mod ( SP) is a must have.
There's also one for MP, which alters the gameplay significantly.
Battlefront 1 and 2 are quite good, even though graphics a bit dated.
But there's a lot of fun SP and MP wise. There's no real SP story in there, but i found it to be more fun then a lot of SP FPS with storyline.
You should take a bit time and search starwarsbattlefront_dot_filefront_dot_com for mods, lotsa great stuff there.