I don't own this cart, but I did some research on them and this cart was designed by the same guy who builds the ZYX carts. From what I understand they are not similiar as the ZYX is a newer and much more highly refined piece of equipment.
These carts were known for the suspension collapsing, so if yours is still working, and you like the sound of it I think I would go the retip route. Soundsmith seems to be the go to guys for this work.
I also know a guy with an AG 2000 with a new VDH retip. I think he wants about $600 for it, to cover the retipping costs. Let me know if you're interested.