Alex,

You need to price a rebuild from Mercedes. Another rebuild on ebay went for $2,600 not 100% complete.

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=1817935021&r=0&t=0&showTutorial=0&ed=1018296627&indexURL=0&rd=1

This is a good price as I see it, and I believe it will sale. I've seen engines with almost 200,000 miles on them go for almost $1,000.