As I noted over in the Media and Inspiration subforum, I think Ron Randall's Trekker has a lot of potential for a somewhat gritty sci to setting a little bit reminiscent of Blade Runner.

[ATTACH=CONFIG]1596[/ATTACH]

[ATTACH=CONFIG]1597[/ATTACH]

American Flagg? Although I could never figure out what was going on in that brilliant comic.

Several of Robert A. Heinlein's works would be great. some of picks would include Citizen of the Galaxy, Have space suit will travel, Tunnel in the Sky, Anything with Lazarus Long in it. Revolt in 2100. Note these are just some of my picks.

Pournelle's Janissaries series would be pretty cool. A group of modern CIA mercenaries gets abducted by aliens and put on a planet that is periodically seeded with humans (so there are cultures based on Romans, Greeks, etc on this alien world) with "orders" to secure land and grow some special crops for the aliens (more to this, but the PCs wouldn't know at the start). Tech level of the planet's "native" humans is spears and swords and bows and cavalry. The modern guys (the PCs) have some modern tech, but with limited supplies.

Has a lot of good game elements. PCs would start off really tough, but have to manage resources. Not completely alien, since the "native" population came from Earth, originally, so there are familiar elements for players to grasp without a lot of explanation from the DM. "Native" common tongue based on Greek and Latin, so not impossible to imagine PCs who could quickly learn to communicate. Exploration. Politics. Combat. Domain management/establishment. A long-term "mission" with mysteries surrounding it.

I could work with all that.