I really like the grey_bluerimlight but with the spec/blue light disabled. Would be cool to boost the mid tones so it won’t look too metallic.
Orb_glowhighlight is very good right out of the box.
edit: Example from one opf my latest projects.
I’ve created this matcap inspired from blinn (zbrush) but with slightly darker midtones and some added reflected light.
edit2: A build in matcap editor/creator would be awesome.
edit3: Here is another personal project example with the metal_bluerimlight matcap
I really like the look!