Congratulations! I myself just recently went through the head replacement procedure on my om603...it is not terribly difficult as far as head jobs go. My problem was that I created alot of "while I'm in there" extra things for me to do. The car looks great in the pictures! It may be worth a drive to check out some of the Crazy Ray's locations throughout Maryland...they don't post their inventory online but at least the one near Laurel on Rt. 1 always seems to have quite a few Mercedes when we stop by as we're traveling through. You never know if you could find a higher number head out there. I personally bought mine off ebay.

Good luck!

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97 S500 (90,000 miles) - wife's car
87 300D (298,000 miles and a replacement #14 head)
94 Suburban K2500 - need something to haul firewood
83 300SD (343,000 miles) (sold)