I highly recommend straight moly grease. Many years ago I bought a 1970 Chevy Blazer 4x4 and it had drum brakes in the front. At the time, I had more money than time so I paid an offroad shop to convert the frontend to disc. brakes. When I picked up the truck the shop owner told me that he had greased the front bearings with a lifetime grease. He told me that I would never need to re-grease the front bearings unless I went river wheeling.
I followed the shop owners advise and drove the Blazer 130,000 miles on the moly grease. The only reason I didn't go further was because the ball joints were completely shot and the frontend needed a rebuild. I questioned the shop mechanic who rebuilt the frontend as to the condition of the front wheel bearings after 130,000 miles on moly. The mechanic said the bearings were in great shape. I've been sold ever since.
If you go the moly route try to find straight moly. They do make a moly / graphite grease but graphite under high heat can serve as an abrasive.
I purchased a 5 lb tub of moly on the internet a few years ago for less than 35 dollars.