I bought a slightly-used Lyra Kleos from a dealer on US Audio Mart, and am quite happy with it. The advantages of buying a slightly-used cart from someone you trust are the cost savings and the fact that it's already broken in. The Kleos sounded great as soon as I got it properly set up (and you do need excellent setup skills/tools to do that). I listen to a lot of classical music, and find the Kleos to have a pretty neutral frequency response; great, natural detail without sounding analytical; and an excellent soundstage. Before that, I tried a Benz Ruby 2 from the same seller, and my long-term cartridge had been a Monster Cable Alpha Genesis 1000. The Kleos is clearly a level better than those other two, and I can hear the improved neutrality over the AG1000, which had elevations in the frequency extremes.
Good luck finding a used Kleos, though. I doubt there are a lot about.
I'm not familiar with your current cartridge or others that have been mentioned, but the Kleos has gotten much praise from critics and Audiogoners. One practical thing I appreciate about it is that the cantilever extends out beyond the front of the body, and that aids in cuing a record. So many other cartridges don't have this.