upgrade to Clearaudio emotion or TT-15
An easy upgrade to either the Clearaudio Emotion or the Marantz TT-15 is to add several layers to the plinth. This is easy because the stock plinth has three threaded inserts already in place for the feet. These are really beefy inserts (metric thread pattern).
So the plan is to exactly measure the locations of these three inserts, and then make wood and aluminum layers that allow a bolt to pass through (the appropriate metric bolt can be bought in any number of places). I plan on adding about 4" of wood and aluminum layers to mine. Then use the bolts to tighten this new assembly to the stock plinth.
I plan on having my "add on plinth" carefully glued and screwed together prior to joining to the original plinth - and perhaps will place a layer of rubber or cork between the add-on plinth and the original plinth - to allow some compression when I tighten the assemblies together.
Then on the bottom layer of your new, far more massive and less resonant plinth you can install the feet of your choice - the originals (add new inserts to the bottom for these) or any type of foot of your choice.
An added benefit of this new assembly is that it will allow me to completely decouple the motor (same motor with either TT-15 or Emotion) from the plinth. A separate layer will provide a motor mounting "cup" (a bored out hole that holds the motor in a piece of wood) - this layer will not contact the plinth at any point.
The other thing you can do with the Marantz tt-15 is to buy the spindle and platter assembly and upgrade it to the CMB - the parts will fit. Of course this will cost about $1000 - but that will buy you the 40 mm platter with the appropriate spindle.
I am going to start this mod in the next month - if you are interested I can send pictures.
Both are great tables with lots of possibilities for upgrade.
At that point you have moved well past the stock Emotion of TT-15