I would just comment that Platinum Koetsu's are significantly different animals than the non-platinum (and less expensive) ones. The main difference is that (properly set up on the correct arm) the platinums perform much better at the frequency extremes than their non-platinum siblings. One pays dearly for this improvement in both cost of the cartridge (the more you pay, the better they get) and in the quality of the phonoamp required to cope with the lower cartridge output.
I have been able to compare on my own SME 20/2a the Koetsu Black, Rosewood Signature, RSP and now own a Platinum Onyx. There is a significant improvement at every step and at each step there is no going back. My Onyx is wonderful but lists at $7.5k!
There is a good recent discussion of Koetsu alternatives here:
http://forum.audiogon.com/cgi-bin/fr.pl?eanlg&1132299685&read&keyw&zzzyx=universe
My first hand knowledge is mainly with Koetsu's but I, too, am curious about the alternatives.
I have been able to compare on my own SME 20/2a the Koetsu Black, Rosewood Signature, RSP and now own a Platinum Onyx. There is a significant improvement at every step and at each step there is no going back. My Onyx is wonderful but lists at $7.5k!
There is a good recent discussion of Koetsu alternatives here:
http://forum.audiogon.com/cgi-bin/fr.pl?eanlg&1132299685&read&keyw&zzzyx=universe
My first hand knowledge is mainly with Koetsu's but I, too, am curious about the alternatives.