2008 Mercedes C300 Sport mars red/black
2007 Lexus IS350 Sport granite metallic/gray
2004 Porsche 986S seal gray metallic/black/black
2002 Jeep KJ Sport white/gray
That car will probably rub with coilovers and 20's.
20's are a bit large for the W211.
I would use Eibachs they are about $ 275 and will lower it nicely.. It may still rub.
Not sure the choice of coilovers or Eibachs will make any difference regarding rubbing. If the tires/wheels are too large they will rub as the suspension flexes through its travel on larger bumps either way.