Cartridge reccomdations?

Thanks for all the great responses! My system consists of a brand new VPI Scout II with the JMW 10 with anti skate and VTA, the aforementioned Shelter 501 III, VPI SDS, Simaudio Moon LP 5.3 phono stage, McIntosh MA6500 amp (I used to run a BAT vk30 to Cary CAD40m's and like this much more for my musical taste), and Mark & Daniel Apollo II speakers. Everything is powered through the PS Audio Power Plant 3 via Audioquest NRG-2's, 72v (upgraded) Audioquest Columbia RCAs and Audioquest Gibraltar Speaker cables. Everything is well-isolated on spiked custom made 3" hard maple butcher blocks...and I do have a VPI record cleaner which I use religiously. I love the way it all sounds now but, as it goes with our kind, I'm always looking for a little more.  Thanks again for the great input!

Upgrade to the 901.

Numark GrooveTool.
Seriously, judging by your system you have the funds to get whatever you like and the expertise to know what that is. You may always wonder it if you don't try a Lyra. Like that girl/guy you were in love with before you met your spouse.

Very happy Lyra Delos user here with similar music playing, I can absolutely recommend this cartridge in case it fits your tonearm. 
I use the Lyra Delos on a Rega P9 and feel no need to try other cartridges, happy where I am.

Lyra Delos is awesome. I am just installing one on a new Technics SL-1200G Table for a customer.