Calling all Dunlavy Gurus

What models of interest do you have in mind? And what are you trying to accomplish?

I have a pair of IVs and am trying to decide whether it would be worth it to mod those or whether I should consider buying some used VIs.

I would look at a pair of IVa's. I've owned both and IMO the IVa was significantly better than the IV particularly in the integration of the drivers. The overall coherence of the IVa is quite noticeable.
The IVa cost about double the IV.

I wonder how many SC-4 owners have taken a good look inside and noticed the splayed wire/clips connections to the drivers. Hard to believe, considering all the intelligence and care John Dunlavy put into his very fine product. Would one attach bare, splayed strands of speaker cable in like fashion to their speakers' terminals? Getting rid of those clips, situating the strands together and soldering to the drivers improved the overall coherence of my SC-4s.