I personally just used the high-temp grease you can buy in a little white tub in the autosection at Wall-Mart for 8 bucks or so. Several thousands of miles later things seem to hold up just fine.

A word of warning: I had the most difficult time getting the driveshaftt back in. It was as if it had gotten 1/8th of an inch too long or so, and it just wouldn't frikkin' go. It wouldn't clear the bushing by just a hair. Very frustrating. Ultimately we ended up loosening the transmission mount. I supported the transmission with a jack and a large square piece of board to evenly support the weight. Loosening up the transmission mount allowed us to push the transmission slightly forward, so we could create just enough space to get the driveshaft in. You might not have any problems, but just in case you do: good luck!

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"The MB W123 is so bulletproof, you can drive them forever. Which is a good thing as it takes that long to get anywhere."
Betsie: 1984 W123 300D (hobby, 280k miles)
Myrla: 2001 Mazda Protege 2.0 ES 5spd (daily driver, 130k miles)
The Turd: 2007 Toyota Camry (wife's car, 118k miles)