Have you played Star Wars - SWTOR game? Because I'm playing it right now, playing solo(I tried a few multiplayer components, but it's a comfortable solo play, too), and it reminds me of KOTOR a lot. A story is great, if you're playing an Imperial Agent or a Sith Warrior - and people say that Jedi Knight might look like KOTOR 3(though I prefer the Empire side of the story, myself).Space battles, intrigues, romance, very nice companions, and, of course, an auction that nobody's going to close(like in Diablo 3).
If you have time, try it - the first ten or fifteen levels are okay for the free players(then XP difference starts to kick in, but I've subscribed and I'm overleveled by now - I think I would've been okay with the story quests only if I remained a free player).