I'm going to be running a Star Trek D6 game for the next couple of weeks, just to see how we get on. I'm using the original Task Force Games' 'Prime Directive' rulebook and the 1st Edition WEG Star Wars RPG, and I've done a quick and dirty conversion so that we can use them both for the D6 system. Hopefully, something will come of it. If not - oh well, we have to try these things.
I'm missing my story-driven, heavy-duty roleplaying with some proper characterisation and melodrama. At first I think 'go complicated' and consider rules heavy games, like MERP or Pathfinder, but then I feel that the rules get in the way. That's why I like D&D 5th, it can be as lite as you want it to be.
In view of that, I'm now looking at Fighting Fantasy again, as keeping it simple might result in some decent roleplaying. Not only that, it'd be nice to game in Titan again.