Everybody has to blow off some steam once in a while I say anger is the best one that shouldn`t be considered deadly.As long as you don`t direct this anger on someone.
I forgot to mention mine. I try to stay away from lust as much as I can, just for clarity. I'm between wrath and envy. I tend to get angry a lot (a trait I learned from my father and amplified by teenage hormones), but for other reasons I get very envious of people better at something I take pride in.
I would probably say gluttony, because I loooove food! I like to eat well, and don't mind spending extra every so often for good food. Believe me, if I ate all the food I wish I could, I would be quite overweight!
All of the 'seven deadly sins' are just natural to human nature... I struggle with anger but that is just me. Lust is the likely candidate for most people though.