You can get a lot of roleplaying challenge out of offering your players a simple dilemma. A choice between two desirable outcomes. If you choose one, you don't get the other. You can take the money, or the mystery box. You can steal the plans, or you can get away safely.
The PCs of course will think they can manipulate the situation to get both things. And maybe they can, if they're clever enough. Always leave slack in your devious GM plans for devious PC plans.
C-3PO: Come on, Artoo, we're going!
R2-D2: Wait a sec. I need all the Peace Moon data.
R2-D2: Come to me, my lovely.
Obi-Wan: I don't understand this... attraction between you and a giant space station. It's... impure.
R2-D2: It's all 1s and 0s! What could be more pure?