The Cien Anos is a wonderful cigar. I like them so much that I give the company free advertising *points to avatar* 8)
Im not sure if I have just one favorite cigar, depends on my taste that day, what size I feel like smoking, what I just ate, where I am at. Here would be my list of current favorites arranged by price.
$3-4 - Padron 3000, Cusano 18 Maduro, Punch Gran Puro
$5-6 - La Aurora 1495, Hemingway Short Story, CAO Brazilia, ERDM Choix Supreme
$7-8 - Pepin Garcia Blue Label, Fuente Don Carlos, Ashton VSG
$9-10 - Padron 64, RP Olde World, Oliva Master Blends 1
$12-14 - Opus X, La Aurora Cien Anos, La Flor Dominica Box Press
$14 and up - La Aurora Preferidos, Opus X, Padron 26
Those are what came off the top of my head. Most nights it doesn't matter what I smoke, as long as I can sit down at the days end and light up then I am happy.