Trip down nostalgia lane
All right. You can pick out any one roleplaying game and your friends will willingly play it with you consistently for a year without making fun of it or giving you any shit (unless you deserve it). You can run it, but if you don't want to one of your pals will run it for you. What do you play!?!?
For me, I think the choice is running old-school D&D using the Rules Cyclopedia. I'm talking "your class is Dwarf" D&D. So basic, but the one book has all the rules for 1st-36th level crammed into it, and all the basic information for Karameikos, Glantri, and all the surrounding nations. And with the advanced rules for weapon mastery and proficiencies, plenty of ways to customize a character. All good stuff. Ah, even thinking about it brings a little tear to my eye. I'd probably start with an old-school dungeon crawl, go to Night's Dark Terror (the one with the fight on the boat), and then work up to x4 and x5, Master of the Desert Nomads and Temple of Death, the two D&D modules I've always loved but have never run. Those top out around level 9 and let's face it, level 9 is a pretty serious year of gaming in old-school D&D.
Your turn!