I never played any star wars games before but after watching all the movies I have an urge to play some star war game suggestions?
As they said, both KOTOR games, but since you don't have a 360, you will need to play them on PC. Both games contained a great story and great graphics for their time.
Both of The Force Unleashed games should be at cheap prices right now for the PS3. The first one is an above average game, the second feels like an expansion and is very short. None have multiplayer, but LucasArts perfected the lightsaber combat in this game. The second also has your using dual lightsabers as well.
If you are going to play KOTOR on PC, you might as well check out the Jedi Knight II game and its expansion, Jedi Academy (which I never did play, as I had II on Gamecube.) And if you have Gamecube, Rogue Squadron 2 might be the best game on the console and that is a blast to still play.
If you like RTS games, Empire at War and the expansion Forces of Corruption are good games. The space battles are phenominal, despite the ground battles being a bit repetitive and not as polished. I can still play space skirmishes for a couple hours though.
Thats about it for the past decade or so of decent Star Wars games. Now if only they could perfect The Force Unleashed in the next one, and come out with a new X-Wing game- I will be happy.