Klipsch's dealer support for the Heritage line of speakers is absolutely terrible. Very few of their dealers are even listed as "Heritage" dealers, and of those, most are only able to order them for you... and even fewer would have a pair to listen to. Like you I'm in a large metro area, Dallas/Fort Worth, and no one even carries the Heritage line. Though I believe one (StarPower) can order them.
Your best best is probably to post in the 2-Channel forum and ask if anyone with Heresy III's (who is local to you) would be nice enough to let you come over for a listen. There are a lot of people on here who would do that. I'd also call Klipsch and complain, but it probably won't do any good. However, if they started getting bad feedback everytime someone is interested in buying/listening to new Heritage, they might eventually take notice.
"All matter is merely energy condensed to a slow vibration... We are all one consciousness experiencing itself subjectively... There is no such thing as death; life is only a dream, and we are the imagination of ourselves..." Bill Hicks