I'm continuing to update the list of blogs participating in the 30 day D&D Challenge. We're almost at 30!
You can see the list here: http://d20darkages.blogspot.com/2013/09/d-30-day-challenge-list-of-blogs.html
I am superstitious when it comes to dice. But I don't have a particular favorite, save for the all the d6 my girfriend bought me for wargaming last spring. (They do roll much better than my old ones).
But I've never had a "favorite" set of polyhedrons for D&D.
A few years ago I did separate all of my "unlucky" dice from the rest. My players groaned at this. But I was getting sick of my NPCs and monsters getting thrashed without putting up much of a fight. I recall that one old orange d20 seemed to roll nothing higher than a 13. It had to go.
About the same time I was playing an Arbiter named Jericho in Dark Heresy. I used this little group of misfit d10s for percentage dice. In Dark Heresy, you want to roll low, but throughout one summer I always rolled high. My character could hardly do a damn thing, even after I took actions so that bonuses could stack (like aiming for a round in combat or shooting in close range, etc...).
Things got so bad that I started to think about ways to take actions that didn't require die rolls, actions not specifically covered by the rules.
It was frustrating, but overall it made me a better gamer, forcing myself to think outside the box and not be constrainted by all the statistics on a character sheet.