I have a pair of the industrial grade ported heresy's. Give them a great source, clean power and set up properly they sing. I think they are worthy of a decent resale value. Jfrech is right about the cost of a new pair back then.
Klipsch Heresy
Is there anything special about the Klipsch Heresy? I remember them from my old college days and they were the low end of the original Klipsch horn line and cost about $500/pr, if I remember correctly. They are efficient speakers and probably better for rock. I happen to got ONE speaker cheap from a garage sale and was looking around to buy another ONE to use as rear channels but they seem to fetch high prices on used market. Some pairs went as high as the orginal retail price.