I have the Kiseki Blue N.S. on my VPI Classic 2. It's an excellent cartridge. Everything I've read about the Purple is that it takes things up another notch. I bought mine here from seller Kron. He has the Purple Heart for significantly less than MSRP - https://www.audiogon.com/listings/lisa76gb-kiseki-purple-heart-n-s-brand-new-cartridges
Having said all that, I have heard a few mentions of people having defective Purple Hearts, so make sure your purchase includes a warranty.
Having said all that, I have heard a few mentions of people having defective Purple Hearts, so make sure your purchase includes a warranty.