My suggestions are usually for lighter systems with less overhead, tipping somewhat into rulesmedium. Stuff like Fate Core or Savage Worlds. I could run ALMOST everything with just those two systems. (and Savage Worlds core is like 10 dollars). I'm also looking forward to the generic Cortex+ Heroic (its first incarnation was Marvel Heroic Roleplaying, which was AWESOME, but unfortunately short lived).
There are other systems that I like, but they are very very specialized things:
Numenera is a really really cool setting, and the mechanics are pretty neat.
Mutant City Blues is a great concept, not completely sold on the GUMSHOE mechanics its tied to, but I'm determined to still use them. The chart for buying Superpowers on the other hand is stellar.
Leverage is another Cortex+ game, the base of the Cortex+ Action system, but its so very specialized towards basically heist movies/show style. Which is awesome though. Seriously, even if you don't like the show its licensed from, its a GREAT system.
On a parting note: If you like Star Wars, and its not all about Jedi to you, Go right now and check out Edge of the Empire and the upcoming Age of Rebellion games. They are both SUPERB and run off of compatible systems and revolve around Smugglers/Bounty Hunters/Fringers and Empire vs Rebellion respectively.