Mike Carey is sharp, but I personally dont like it when a ref gets over animated when making calls.
Personally, I like Walt Coleman above all nfl head referees.
He has a strong Southern accent (doesnt bother me but some dont like it), and he doesnt get overly excited when giving the penalty report and thus never appears to be favoring any particular team.
Havent looked to see if hes still around, for I believe he retired last year, but blum #7 moved from head ref to line his last couple years. He was another total mobster and probably shouldnt have been in nfl for his calls were weak.