Do your wear a cross? An ankh? A muzzuzah? Spark plugs fall in the same category. That's why various precious metals come in and out of vogue. (Right now iridium is HOT!)
I personally think that the best decision is revealed by the color of your hair and eyes. My wife tells me I'm a Winter. NIGs thus won't work for me (dammit!), But Champions are just fine. (especially in platinum)
-nod
Italian motorcycles. An Italian car. An Italian wife. What more could a man desire?