Moerch DP6 is the obvious arm if you want low effective mass - the 9" green dot arm tube is 4.5g effective mass and the red dot arm tube is 7.5g effective mass.
High Performance Low Mass Tone Arm Suggestions Needed
The turntable that is the repository for this arm is my SOTA Cosmos Eclipse, so that means we are talking 9 to 10.5 inch arms. The cartridge to be used is an Ortofon MC2000, it weighs 11 grams so a substantial counterweight is needed.
Looking for my highest quality options to make this combo work. Absolutely love this cartridge, so it is to be my long term reference, which is why I am willing to invest the time and money to find the best pairing.