I would think that a wide range of your products (not just the headphones) would appeal to the Head-Fi crowd. If you're looking for suggestions of what to bring in addition to the headphones I'd suggest items from both the Ipod speaker line and also the computer speaker segment at a minimum. And as suggested by others, most of us with headphone rigs also have a speaker rig of some sort. Whether that's HT, 2-channel or both we don't limit our insanity to headphones.
And I'd certainly love to see Klipsch there regardless of what they bring. More choices is always better in my book.