Those are the ones I can think of off the top of my head, the ones I really tend to love. Have you read any of them, you or anyone else here?
The Retief series of books? I loved those. I read a few of them when I was in high school, I thought they were hilarious.
-Kevin
I've read some Heinlein, my favorites of his being Starship Troopers and The Moon is a Harsh Mistress. My wife is the real Heinlein fanatic in our household (pardon me while I ping her here). I read a lot of Asimov and Clarke when I was younger... Niven and Pournelle have written two of my favorite books, Footfall and Lucifer's Hammer. I haven't read much of their solo stuff, though.
I've read some of James Hogan & Charles Sheffield, a little of Tad Williams & George R. R. Martin (primarily in the "Wild Cards" series), I read a lot of Keith Laumer a long time ago (primarily his Retief & Bolo stories), haven't read any Orson Scott Card or John Ringo.
My own all-time favorite author is Roger Zelazny. I've read everything he's written, multiple times. Of current authors, I'd say my favorite is Peter Hamilton... I think his "Night's Dawn" trilogy is a really good space-opera, although it may not be for everyone.
If my wife gets some time to chime in, you'll find her favorites (Heinlein, Alan Dean Foster, Anne McCaffrey) are at quite a variant to mine.