I lucked into a pair of Sony R10's for an amazing price, but of course there was a reason - one of the drivers is totally shot (completely beyond repair - it looks like the previous owner tried to have it repaired or repaired it himself, and the diaphragm's torn, the coil leads are gone, etc).
So, what would you do? Money's tight right now, so try to take that into consideration.
1. Wait patiently for a driver to show up in the marketplace, which could take years, and which could cost a very pretty penny.
2. Put a pair of CD3k/CD1k drivers in there, (and maybe sell the one working R10 driver to pay for the CD3K's).
3. Same thing as above, except use SA5000/SA3000 drivers instead.
4. Give up, sell the R10's as they are, and use the money to buy something else.
5. Something else I haven't thought of?
If it makes a difference, these are bass-heavy versions.
And one last question: the yellow foam rings inside the cups are disintegrated - if I decide to stick with these headphones, is there a replacement foam material I could use instead?