I'm really enjoying the 'Grand Tour' books by Ben Bova. He's been around a while, though. I recommend:

Orion Series (start with Orion)
Moonwar and it's sequel Moonrise
The Precipice and its sequels, The Rock Rats and The Asteroid Wars
The Grand Tour series (they are connected, but it's not required that you read them in order, Mecury is the latest in the series I believe):
Mars and its sequel Return to Mars
Jupiter
Venus
Saturn
Mercury

And for a good time, try Sam Gunn Unlimited and Sam Gunn Forever