[adm]

It would be hard to set up a RPG selection without some form of D&D, it's market dominance almost requires it, so the the three Core D&D 5E books. To catch the Super Heroes boom, maybe Champions, and then a generalist system like GURPS 3E. If you want to combine some stuff, maybe Champions and the HERO system, and then the current Star Wars RPG to draw interest, or maybe something like FATE or World of Darkness for the different narrative structure.