Hm. Well, here's my standard take on a full-party game, so you let me know if this works for you, and then I'll see what I can do about banging out a plot:
Using PFRPG (Pretty much all materials are on D20pfsrd):
-15 Point Buy for stats
-Everyone gets two traits, in addition to their starting feat
-All players begin with a free "Adventurer's Kit"- Backpack, Bedroll, small sundries that make traveling easier (i.e. soap / razors), and three days rations.
-Average starting gold
-I allow classes from all four main rulebooks- Core, Advanced Player's Guide, Ultimate Magic, and Ultimate Combat. This includes all major archetypes, and the Words of Power spellcasting system.
-Because Gunslingers are allowed, the settings I run are considered "early guns" only- so no one is likely to be running around with a revolver or shotgun.
-In addition to the core races, I allow PCs to be Sylphs, Oreads, Ifrits, Undines, Tengus, or Gripplis. I'll consider other suggestions, but there's a high chance it will be vetoed.
As to the more "E" side of things:
-I'm willing to accommodate pretty much anything but blood/torture (including menses), underage, and a few other personal squicks, so if everyone participating gives me a list, I'll try to include set-ups for a little bit of something for everyone.
Again, let me know if this works for you.