If you've ever played rifts, that's the way I'd have the setting.. set across and open land where there technology (energy weapons, hover cars and huge ATVs and other groovey stuff), psionics, magic and pre-rifts stuff (rifles and old fuel trucks). Have the first game as the main book plues a few others and then have expansion packs as the extra books.
Now I start thinking about it.. that'd be HUGE! hehe... And just walk around and talk to people, hear about quests and complete them.
