Mighty Favog: I only ask this because there is a chance that I would be replacing them anyway if I ordered a pair.. With the economy as it is it would/could save a bit.
First I think it's great that you are considering the new Heritage.
Just curious but which model or models are you interested in and why do you feel like you would want to change them?
Have you heard the newest updated models?
I heard them all at the 2006 pilgrimage in Hope and given a good room for them to be placed in IMHO you would be very hard pressed to improve on them by changing crossovers. Now it would be easy to make them sound different but a real improvement with a crossover change is a different story.
The Klipschorn with the AK-4 network at a friends house gives the least colored and most detailed and tight bass that I've heard from it to date.
The LaScala II that day was probably the one I would have most wanted to take home that day based on the sound in the room we heard them in that day. I've owned LaScala and Belle Klipsch both and this by far was the most impressive sound I've ever heard from them.
The Cornwall III and Heresy III are both very good sounding and again I wouldn't automatically assume that they could be improved with a crossover change.
Of course all this is just my opinion/experience and my taste for what it's worth.
mike tn