So far, I've enjoyed The Brethren the most. I've also read The Client, and The Street Lawyer, and I'm about halfway through The Firm. I"d recommend any, and I'd like to read A Time To Kill next, if I can find a cheap copy somewhere.
As for Clancy, I'd recommend starting with The Hunt For Red October and reading the first few Jack Ryan books. I never did finish Clear and Present Danger or any of his books after that, but that's a patience thing.