Well, if you like Crichton, then you'll definately like Douglas Preston and Lincoln Child's co-writing efforts. They're like Crichton, but with much better characterization.
I find with Crichton's work that I really don't develop much in the way of feelings for his characters - to the point where I don't give a flip what happens to any of them. Those dinosaurs could have chowed down on the lot of them in Jurassic Park and The Lost World and I wouldn't have cared.
Crichton's research may be a little more thorough when it comes to the "science" behind his novels, but I feel the better characterization and what I think is a better sense of adventure make for better reading on Preston and Child's part.
And James Rollins books are very much similar to Preston and Child's.
Oh, and I just finished a book called "The Swarm", by a German writer named Frank Schatzing. It's a little on the the long side, but quite fascinating. You'll learn a lot about the ocean reading it.