Although THE BRASS VERDICT is fun because you get to see Bosch and Haller working together for the first time, I'd almost skip past that one, incorporating some elements from it (like the aftermath of Haller getting shot), and do THE REVERSAL as the next film. Haven't had a chance to get through FIFTH WITNESS yet, but I really fell for LINCOLN and would love to see more movies with this character. I'd also be a big proponent of a "one big case a year" series, too -- but they should get Matthew Perry for that one.
Harry Bosch, too, but only if Chris Noth or Titus Welliver plays him.
Oh, and I have to demand that any sequel bring back Michael Pare.