Just kidding. I've seen people spend anywhere from $500-$1000. Most people I've talked to prefer the EVO I style on 190E's. Other than the EVO kits, It's difficult to take something Euro and make it look classy after ricing it out. Most of the time it ends up looking horrible. Personally, I'd rather leave mine alone.
Except for Reiger and Wald, the other companies either don't make the parts anymore so you'll be hunting for used or old stock . . . or they're trapped on the shelves of Fendertrim or Car Shine in Australia. 
BenzWorld.org forum is one of the largest Mercedes-Benz owner websites offering the most comprehensive collection of Mercedes-Benz information anywhere in the world. The site includes MB Forums, News, Galleries, Publications, Classifieds, Events and much more!