190E suspension suggestions

Hello everyone! I am about to replace shocks and struts on my 1991 190E (126,000 miles) with Bilstein Comforts. Should I replace the rear springs as well since they are relatively inexpensive? What else should I replace in the front end while I am at it? The only problem I have noticed (other than shocks and struts) is a slight shimmy or shudder in the steering when I go over bumps at hiway speeds. I will also be putting on new tires while I am at it and would like to know if anyone recommends anything other than Michelins. Thanks for your help, and I really enjoy following this forum, and the speedy service and reasonable prices from FastLane.