If you don't have time to fix it, you should just get an estimate from the Dealer to fix it, then decide if it is worth it or not. A local indy shop, specializing in Mercedes-Benz, might be a better way to go on this one, if you are wanting to save money on it.

I know that the head gasket itself is expensive because its an HWA number ~200 dollars list, maybe you have the hook up, who knows. You should investigate further to see if its really the headgasket before you just walk into MB and say my headgasket is bad because if your rear main oil is bad, that might be cheaper on the parts, but the labor either way is going to be the expensive part either way.

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Current Stable:
1994 S500 v140, 210k miles, white with grey.

Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold (rumor has it, that it has 750k miles on it now)
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 "300E" Amg Hammer 88k mi sold (it was really a 200, not even an E (124.020)
1992 500E 156k mi sold
etc.