I agree. A Hohner blues harp is the way to go. I much prefer wood to plastic too. Harmonicas made with wood and metal can be soaked in a glass of water before playing and are then much easier to bend notes when drawing hard on them playing blues style. I really like Hohner Marine Band harmonicas.

See http://www.sheehans.com/harmonicas/help/ for help on selecting the harmonica in the key you intend to play in.