Technics SL1210GAE + Accuphase E-480 (AD-50) + ??? (cartridge)

Looking for some great cartridge options for the Technics SL1210GAE (stock) and the Accuphase E-480 with the AD-50 phonostage.  The challenge I see is that many options like the Kiseki Purpleheart seems to want higher loading than the AD-50 is capable of (300ohms, max).  I'm looking to spend up to $4000 for a cartridge that sounds amazing.  Using Magico S5 MkII speakers.

I like authoritative bass, but a really airy midrange and treble that has a clear "ease" to it.  I like my midrange "painted" in front of me instead of coming at me.  I had heard the Purpleheart was great that way, but I'd prefer not to get into separate phonostages for a second system, hence the use of the AD-50.