I picked up a pair of the SC-IVs a couple of years ago for $2,500.00 which were not only functionally perfect but also without any visual flaws. I passed on a couple of lower priced sets that were around $2K. I've always felt that if gear looks like it's been cared for there's a better chance that it's in good shape sonically as well.
As a side note, I use the SC-IVs as the main channels in our high-end Home Theater room and use the SC-Vs as the choice for our reference 2 channel set-up. With the SC-Vs I have also incorporated the larger Dunlavy Sub (very rare) that incorporates four 10" drivers into an SC-IV size enclosure. Needless to say, the system is capable of moving some serious air in that room.
As a side note, I use the SC-IVs as the main channels in our high-end Home Theater room and use the SC-Vs as the choice for our reference 2 channel set-up. With the SC-Vs I have also incorporated the larger Dunlavy Sub (very rare) that incorporates four 10" drivers into an SC-IV size enclosure. Needless to say, the system is capable of moving some serious air in that room.