Phil,
Have you thought of doing it yourself? I was suprised what I could do as a complete novice with my 230SL (no clear coat). I just had these basic tools:
Me (no power buffer)
100% cotton terry cloths
Meguiers(?) wash, cleaner, polisher, and wax (all liquids)
Time (6 hours)
Rodd
1966 230SL Euro
1994 E420