Dry mount, and use a spiral thingy placed in holes in the over mat. PITA to put together.
It sounds pretentious, but I put the prints for showing into a nice box the same size as the prints (dry mounted w/ about 1 1/2" borders for handling) and stack them print, tissue, print, tissue, etc. I used to ask clients to use the cotton gloves I laid in the top of the box, but that was not gonna happen if I wasn't there, and I didn't like asking anyway. The borders take care of handling marks. Eventually the fiber prints get flaked here and there, but you just have to make more.
I like DW's suggestion too.