I see you are invested in the front end of your system but "the rubber hits the proverbial road" with the speakers. If you can save the money, and add to it, there are some really good bargains to be had, for speakers. It appears many heavily discount speakers maybe because of difficulty with packing and shipping. I have seen Wilson Sophias as just one example go for under $5K, so keep the speaker upgrade option in mind. The front end is really very nice, I happen to like the Dyna 20X. I am sure there are plenty of different ?better? sounding cartridges out there. The question is, without better speakers, will that investment's full improvement come through?
I suppose if you are really iching for a cartridge upgrade maybe you buy something that will allow you to still have some to start a speaker fund.