Mission Based Gaming Fantasies

I'm getting fidgety with my gaming. I keep having thoughts of running something more episodic in nature, versus the saga-esque nature of my Dresden Files game. Basically, run a campaign where there's a more defined beginning, middle, and end, versus the shifting boundaries of how my current game is settling where there's rarely an easily defined path to success.

And I'd like to change that for another game, not that I have the time to run one. A game where there was an assumption of competence and success. Plus, some of this is gamer ADHD where there are all these neat systems out there that I want to try out. For example:

• Cortex+: either Leverage or Marvel Super Heroes. The latter is probably better suited for what's in my head which is more "beer and pretzels" of getting a few friends together and gaming without needing to remember every detail of what happened last session.
• Night's Black Agents: The temptation here is because my games keep being about investigation, investigation, and more investigation, and Gumshoe is supposed to be about the investigation - it is designed around it, and this iteration has a more robust combat system to back it up. Probably wouldn't use the setting precisely as written, but there'd definitely be something of the Weird™ at play.
• Home Brew Mercenaries: Inspired by listening to some actual play podcasts of a Mass Effect game involving a mercenary company, while I don't want to play the same system (modified nWOD), but the idea of playing a game with a group that has a mercenary company to control and build up, as well as playing the individual mercenary, appeals to me

Some of this is in reaction to something I was reading of FATE where it best supports when the players have a stronger vision, and the GM works within that framework, this would be within the notion of reversing that dynamic where the GM has a stronger vision of how the game goes (by controlling the missions with input from the players) so there will hopefully be less of the players "grasping around in the dark" trying to find a workable solution to the challenge.