Manhunter is good too...but I think Red Dragon is better...
Michael Mann's style doesn't leave a lot of room for warmth, which I suppose may seem like an odd requirement for me to focus on...but in fact Red Dragon makes you care more about the characters, and that is a good thing in a thriller...because you have to care about the characters to fear for thier safety on the screen. Ralph Fiennes, in particular, is remarkably multidimensional in his portrayal. Edward Norton is also very good, Emily Watson is always good, Philip Seymour Hoffman is always good....etc etc....
The only person I had a problem with was Harvey Keitel...he seemed more like a NYPD beat cop who made good than an FBI psychology whiz...Scott Glenn in Silence of the Lambs seemed more ivy league and on target.
One reason Red Dragon works may be that they brought back Ted Tally (from SOTL) to do the screenplay. While I am a David Mamet fan, I have no doubt his adaptation was part of the problem with Hannibal.
Once Red Dragon comes out in DVD it will be interesting to watch the 3 movies in (plot line) chronological order one right after the other...