Some years ago i ran a few (old) Mercs and was a member of the relevant forum, MBs suffer from the same issue as ours in that our wheels have lathe cut and laquered faces, with normal paint on the rest of the wheel, when in good condition they look lovely in that two tone effect and glitter slightly without being garish in sunlight and under street lights.
Getting normal standard powder coating doesn't give you that effect and they can look kind of dull afterwards, whilst getting them refurbed to OE standards will cost over £100 each wheel and as with the OE situation the laquer finish isn't robust and any pinpricks will allow salt water under and the spider tracks will be starting back after one winter.
The MB lads had some success with the then newer chrome paints on the scene, those who had seen them reckoned they were as close to OE as you were going to find but a much more resilient finish, for a price somewhere above plain powder coating but not up to the eye watering cost of lathing and laquering with separate painting of the rest of the wheel.
Mine are still OE finish and still don't look too bad, to my eyes if i squint a bit
, but if and when the time comes i'll be looking for something like that myself.
I too think the OE wheels looks just right on 120s, whilst other LC models seem to take aftermarket wheels well they somehow don't gel on our motors unless you're into £500 a corner jobbies.