I prefer my sci-fi hard
Not sure what to read now
are you familiar with Greg Egan? One of his most recent "Incandescence" is so hard that I think a physics degree is required.
But his earlier book "Distress" is ABSOLUTELY perfect. Unbelievable how good it is. He's also well known for his short stories and novellas and I'd recommend those as well. (There's a gay themed one that is excellent but I can't remember the title. Almost all of his short fiction gets shortlisted for the Hugo and Nebula and he's won those multiple times.)
Another personal favorite, very deep, if not hard sci-fi is Jack McDevitt's "The Hercules Text."
Not really "hard" sci-fi but one of the best writers today is Robert J. Sawyer: Flashforward (forget about the short-lived TV series, the book is incredible), Calculating God, The Hominids/Hybrids series, Rollback. He's so good and so fast that I'm behind by about five books already.
And not hard sci-fi at all but so good that when I think of it I forget that it's not by Ursula le Guin--it's THAT good: "Dark Water's Embrace" by Stephen Leigh. What's good is that although it's out of print for a while Leigh now has the rights and you can get ebook versions. The sequel "Speaking Stones" is real good as well.
Sheri Tepper's work is incredible but not hard sci-fi.
A book that now is a series that I've fallen so far behind on I may as well admit that I'll need to start over is Allen Steele's "Coyote."
So. I hope all this isn't irrelevant since the summer's over.
Oh, and the best gay coming of age novel that no one seems to know about is John Fox's "The Boys on the Rock."
Oh, and for "dark fantasy" or gothic fantasy or whatever, one of the best writers period is Elizabeth Hand. Her short story "Justice" wow! Her book "Waking the Moon." Flawless. Her first novel "Winterlong" so many ideas in the first couple of pages.
I know this is a lot to throw at you. PM if you want more info and where you might want to start. I'd say the short answer is Egan's "Distress." Then, "Dark Water's Embrace," and then "Waking the Moon."