I don't think you ought to write off your Avid table just yet. The Volvere is an excellent table, no existing arm or cartridge is sonically too good for the table although linear trackers are not a great match. You should consider getting the motor and power supply to upgrade it to a Volvere Sequel.
The high mass tables have a very different flavor but I am not convinced that they are better in an absolute sense. The Volvere has an articulate, incisive sound with tons of PRaT (apologies to those who hate the term). I think you will find the Teres especially something of a sonic polar opposite. While you will gain some sonic weight and richness you will also give up something. To use a motoring analogy I think you are looking at going from an autocrosser to a grand touring car.
The high mass tables have a very different flavor but I am not convinced that they are better in an absolute sense. The Volvere has an articulate, incisive sound with tons of PRaT (apologies to those who hate the term). I think you will find the Teres especially something of a sonic polar opposite. While you will gain some sonic weight and richness you will also give up something. To use a motoring analogy I think you are looking at going from an autocrosser to a grand touring car.