I'm with Rhimmer in the same regards... I don't particularly care for "Store Bought Wall*Mart Superheroes" because they tend to suck.
Personally, I've never celebrated Halloween all that much growing up, so I never really bought a costume. Now that I'm an adult, I'm actually making an effort to make Superhero Costumes the way they were meant to be: Tight fitting Spandex gear with a huge "wow" factor.