What's A Good Upgrade From A Manley Steelhead?

I'm on a mission to improve my vinyl front-end. Starting point is to replace the Graham 2.2 on my Basis Audio Debut Gold Vacuum, followed by a new compatible cartridge, next will be a different phonostage.

I like the Steelhead but I'm sure there's something better out there. I've around $8K  to play with and prefer to buy used. Has anyone stepped up from the Steelhead successfully, if so, what did you buy and how much of an improvement was it?

Appreciate any thoughts/ideas?