Im Sorry, But having smoked, serveral Partagas series D, and several Opus_x, I must say I really love the series D #3 or #4, far superior IMHO, to the Opus_X. The Opus_x, is a very good cigar, but for the money, I would go with anything ISOM Partagas, especially the SeriesD.
Just My Humble Opinion.
Later
Dave (A.K.A. Homebrew)