I think Werrd only did a couple prototypes.
Spintastics is working on another run of their aluminum tops, but I don't think they will be ready for a bit...
E-mail YYF, they should still have some Throwbacks and Acrobats left, I think $100 ea., they are aluminum with delrin tips...
I would recommend a delrin body, steel tip (makes much more sense) top; the Giulia by Strommol8 (S8).
I'm on the S8 team, so take it for what it is worth, but this is the best top available, and I vote the best top ever made in any kind of quantity.