Thanks to the name (and the way I am pronouncing it) I couldn't help but picture David Zayas who plays Angel Batista on Dexter.
Calhoun is an easy cast-- actually. I've said for years that it should be Jonathan LaPaglia (who played Lt. Frank Parker in 7 days). http://www.imdb.com/name/nm0487405/ At least, that who I picture in the role.
I don't see how he's "so far off," but even if there are differences from Peter David's description... it's television, workable.
Though I've heard Admiral Nogura was intended to be played by Toshiro Mifune, I've been unable to associate anyone other than Emperor Akihito with the character (if perhaps 10 or 20 years ago as Nogura circa Open Secrets).
I don't see it. Muller's kind of a statuesque woman, isn't she? The 6-foot-tall Marjorie Monaghan has been suggested for her (though she's also been suggested for Domenica Corsi). Leick is a respectable 5'8", but quite skinny; I never found her physically convincing as the ultrapowerful warrior she was shown to be on Xena, though her superb acting compensated for that.
While reading "Full Circle," Tim Roth, the actor who plays Dr. Lightman on "Lie to Me", comes to mind for Hugh Cambridge.
Reading Full Circle now and I have Hugh Laurie (he of Blackadder and House fame) as Voyagers new Councillor.
Counselor. Counselors give counsel. Councillors are members of a council. Many councillors have counsel.
Given the character shares a first name with Hugh Laurie, his last name is Laurie's alma mater, and his attitude shares much with Laurie's most popular character, I think the casting of Laurie as Counselor Cambridge is definitely going along with the author's intent (though Kirsten will, of course, correct me if I'm wrong....).
Cheers for that, it was very late and I was rather drunk last night when I posted that and just clicked on the first word in the spell check list.