When the three screws are set properly there will not be any advantage to getting a lesser table. Once you screw up the cart alignment on the new one you’ll have the same problem - lack of skill and experience. For the record, if you have concrete floors, dump the springs for the pucks.
The MK IV responds extremely well to tweaks. My best tweak was the sapphire thrust pad and ceramic bearing from Applied Fidelity($195). I found that replacing the springs, feet and clamp were all well worth the investment too. If you have a period JMW 10 arm, my mods are listed at http://vpiindustries.com/forum/viewtopic.php?f=11&t=4881. The improvements are over-the-top phenomenal. All table and arm mods were applied over the last three years.
The MK IV responds extremely well to tweaks. My best tweak was the sapphire thrust pad and ceramic bearing from Applied Fidelity($195). I found that replacing the springs, feet and clamp were all well worth the investment too. If you have a period JMW 10 arm, my mods are listed at http://vpiindustries.com/forum/viewtopic.php?f=11&t=4881. The improvements are over-the-top phenomenal. All table and arm mods were applied over the last three years.