'92 300SE. I get some shimmy in the steering wheel when slowing to a stop from speeds in excess of 50mph. I've not tested it hard, so I don't know if the problem gets worse with hot brakes vs cold.

In my US-made car, this is usually an indication of either warped rotors, or inconsistent friction between the disc and the pads due to uneven friction material deposits on the discs - usually a result of poor break-in methods after new pad installation.

I'm thinking about the following:
1) Check of all front-end components for wear. This includes ball joints, tie-rod ends, drag link, bushings and rims/tires.
2) Front-end brake job - surface rotors (replace if below spec) and new pads.

Are there good sources for aftermarket brake pads & rotors, or should I stick with MB-OEM parts?

Suggestions are appreciated.