Got the table now I need a good arm and cart combo

The rega RB300 is a match for the townshend. In fact, their excalibur tonearm is based on an RB300 with different bearings and other stuff depending on the version. The Rock III will take a high energy cartidge, especially when using the trough. Do you still have the cartridge paddle attachment. I am using a Monster Alpha 2 on my Rock III with great results. Try the ZYX Airy series made by the same inventor. Does your seismic sink still hold air?

you should be able to get one from townshend itself. They still use the same setup on the newer tables, just a double version.

too many arms, tables and cartridges. It have an etII arm too that is for sale, also a Grace 704