I used to do ANSI logos way back in the day (late 90's) as part of a professional BBS art group.. There's a lot more I'd need to know to make a logo for you:
1) What colors are outright unacceptable?
2) What colors are 'must haves'
3) What do you want people to 'feel' when they see your logo?
4) Text only, or Text plus a picture?
5) You say Sci-Fi but are there particular elements of sci-fi you like? What are some of your favorite movies, games, themes, etc?