What cartridge for a prime super scout 10.5 arm.? Budget $500

With your red line at $500 you’d better look for vintage MM carts in NOS condition. Nothing can beat’em if your limit is $500!

If you did not learn the lesson with Sumiko you can buy an MC, but I think you need something with user replaceable stylus (and this is MM).

The Hana SL retails for $750, but can be found for less. 

I appreciate all the recommnations.  When I first went to order a cartridge after the receiving  the VPI, I called Upscale audio for recommendations. I told them my price point and they recommended the Sumiko Bluepoint No 3 & the Hana EL. They said either was a tossup with the Sumiko being easier to mount since it's threaded. I would like to try the Hana SL however it's above my price point. I'd like some more recomendations in my price range especially from real world VPI owners. I'd also like to know what the sonic differences are between MM & MC especially since my Mac C50 can take either one. My audio dealer who did a great job installing and aligning the Sumiko said that he's had good results with Denon cartridges. Any thoughts on those?

Consider  a Nagaoka 
MP-200. MM.

Most NOS carts are old tech, Ancient history.