What game engine you elect to use I'd think would be more a factor of exactly what sort of gameplay experience you want to convey. Within FPS games, a couple come to mind- the Unreal engines, the Quake engine, even the LithTech one- but without seeing a design proposal, I wouldn't venture a guess as to which would best suit your needs. If you're serious about wanting to make a game, the general advice is to write a design overview, and have it critiqued by colleagues and other people in the industry; then proceed to writing a full design proposal. At that point, invest your time in doing prototype work and proof-of-concept. I may still have a copy of a document written by Ron Gilbert, who's a veteran of the game software industry for many years (Curse of Monkey Island, Total Annihilation and many others) about how to go about the design process. If I can find it, I'd be glad to share, and also to provide an opinion of someone who's worked on a few projects and written a proposal. -WingedElf (ex-Cavedoggie)