Re Mary Gentle: I like her a lot, but she seems to be a more particular taste than some other writers. 1610 is more geeky than Ash, I think: Ash is a secret history. (I just realized that anything I say about 1610 is likely to be a spoiler, so I'll stop for now--there's no way to put an lj-cut in a comment.)
Again, I like Griffith a lot, but would suggest that Ammonite is as geeky as Slow River--but that's more biology, and Slow River is more computers/"high tech" stuff, so it gets more geek points.
Wild Seed is excellent, and not as dark as some of Butler's work; I'm not sure how geeky it is, in part because it's been a while since I read it, and in part because I'm not sure of definitions here. It's geekier, imho, than The Female Man, for what that's worth.
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Again, I like Griffith a lot, but would suggest that Ammonite is as geeky as Slow River--but that's more biology, and Slow River is more computers/"high tech" stuff, so it gets more geek points.
Wild Seed is excellent, and not as dark as some of Butler's work; I'm not sure how geeky it is, in part because it's been a while since I read it, and in part because I'm not sure of definitions here. It's geekier, imho, than The Female Man, for what that's worth.