And blended them into some hybrid crossbreed game, which elements would you take from which game?

I would take the battle system of X-2 and the job system and the story and characters from X. I also like the way you can move about freely in X-2 and it was more difficult in X. I would also take the weapon's customization from X and the "missions" from X-2 to be added on as side-quests in the main game.