Sci-Fi and Fantasy for myself as well. I read a LOT, so I won't bother with specific books - just a list of authors whose work i've enjoyed over the last few years:

Robert Jordan
Isaac Asimov
Arthur C. Clarke
Eric Flint
Robert Asprin
Robert A. Heinlein
George Martin
Frank Herbert
Nick Pollotta
R. A. Salvatore
David Weber
Lois McMaster Bujold
Jim Butcher
David Eddings
Neil Gaiman
Terry Pratchett

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I've read about 80% of everything the writers above have ever written, so I feel quite safe recommending these names...