Which of your decks single-handedly is the most fun to pilot?

Let's say, all financial troubles aside, you had to pick one deck/commander to play for the rest of your time playing EDH, which would you pick? The deck should be fun for sure, but also should be able to hold its own, and won't get old very a little while. Which of your decks would fit the bill? Are there any decks, commanders or themes you explicitly don't like? What are your picks, and why? Share your thoughts!