Mine isn’t a specific game, but rather game-genre. I would love to get into a gritty, military sci-fi game. I have touched it on occasion, but never had the luck of playing in an active campaign that lasted more than 4 sessions. Traveller, Hammer’s Slammers, even Warhammer 40k with its mentalists and demons would be alright in my book. Settings like Apophis Consortium’s Obsidian or Mongoose’s take on Judge Dredd would also work for me.