Time to bump this one up again
Finally bit the bullet and bought a LeCroy DDA120 off of ebay as a parts unit, no testing, no line cord etc etc. I figured I could use the power supply to repair an LC584 that's been apart on my bench (also bought as a repair project). If I got a power supply and the CRT I figured it was well worth it.
Plugged it in and turns out to be 100% functional. I think the "Disk Drive Analyzer" moniker throws non-technical people and they have no idea what they're dealing with. This one came from Maxtor by way of Dovebid. The seller probably bought a pallet of them, they've been sitting on ebay for months. Every month or so I'd do the rounds sending out offers and finally got a bite.
Now I can bundle up the 584 and put it on the shelf as parts and start looking for a set of probes (which will probably cost more than the scope). That makes for one easy repair.
Yes it's big and heavy and a little loud, but I have the bench space, it has tons of math options + FFT and where else are you going to find a 8Gs/sec color scope for $300?