Koetsu-like Cartridge recommendations

Can you demo a new Onyx? The recent carts have some changes in the design and the sound: tighter, without losing the lifelike timbre. Make sure you have an excellent transport. Koetsu has been designed on turntables, that can do rhythm, and on those, where this is not a priority, one could have some issues. The tone arm should be chosen carefully, Onyx is a low compliance cart.

I love my Benz LPS....

Yes, as Emil_f mentions, they have to be on the right setup. My Jade Platinum was not a good match for my Basis 2500, and Vector 3 combo. I think a stone body Koetsu requires a commitment to a specific type of setup. There is certainly a fair amount of info out there on some good choices. I am sure it would help, if you mentioned your setup.

Ken Kessler once said the Transfiguration Temper V has very similar bass to the Koetsu. Never heard a Koetsu in my system, but I do have a Temper V and it is exxcellent. The Shelter 501 is a warmer cartridge - so I guess an expensive Shelter may be a good alternative to a Koetsu.