The PW grease is certainly good stuff, I haven't purchased any because of the price though. I use the Shimano Premium/Dura Ace grease for all rebuilding of the various cups, cones and ball bearings. Yep, it can be expensive if you don't watch who you buy from, I searched a good bit at Amazon and on ebay, I finally found some of the 100g tubes at a fair price on ebay. The small jars are pricey, watch for the various shops selling it in the tubes or the large containers to get the best price.

Or, just use some of the Marine Grease you mentioned, it should be fine. Park Tool has a fairly decent grease, too, I just favor the Shimano product, personally.

Bill