"The finest cigar available" is a very hard thing to pin down. Primarily, because the judgment of the quality and taste of a cigar is very subjective. Secondly, some would consider "available" as being able to go to a local cigar store and buy one. Others may consider "available" as obtaining the cigar at any cost or risk. That being said, I think that the above suggestions are a good start.
If I had to pick one cigar above all others it would be a Bolivar Gold Medal cigar from the Siglo XXI Humidor (~price of 1/2 million US). Of course it would still be unsmokeable for another ten to fifteen years.