I really like storm grey/gray. I have ordered a few versions and it sells whether it has yellow, red, or orange accents.
I have also custom ordered a few cars in various other (shades of) gray.
the metallic grays tend to have various colors in them and I categorize them this way:
silver/black hue- porsche volcano gray, seal gray, sarthe grey, zenith black, onyx black
green hue- Storm Gray,
bronze/brown hue- Porsche Agate Gray, Blade Silver, fire black
blue hue- flintgrau (PTS), Saros (new 720 color),
gray non-metallics, I refer to as
Saturated: Porsche Graphite Gray, Ceramic Grey
De-Saturated: Chicane Grey
then, a further delineator:
texture:
creamy metallic: small, evenly spaced flakes- cerulean blue, silica white, volcano yellow, tarocco orange
grainy metallic: rough, course flakes of various sizes- supernova silver, burton blue, fire black, volcano orange, volcano red