old classic phono cartridges

You've got several interesting cartridges there.  Yes, some of them are competitive with some of the upper end cartridges (in terms of cost) that are available currently.  In the end, it's a matter of taste.  On the other hand, you've already absorbed the cost of what you've got; why not save spending yet more money on new cartridge(s) that may only be about as good?

Rot is the problem with most old cartridges, not the tip. 

I would definitely send the Clavis back in for retipping and any other thing it needs. Its a great cartridge ... and not many can touch it on reproducing the piano accurately. Pay the extra bucks and have Lyra do the repairs. 

I also have a Carnegie and Clavis. The latter us well worth resurrecting!

Recently sold a Micro Acoustics 630 for about $300 to a European (German) buyer. Stylus/tip was in good shape, but the rubber dampers (who knows)? These used a beryllium stylus and pure gold wiring.

Looked into re-tipping but very few if any re-tippers would tackle the job. Replacing the dampers was the main sticking point.