There are three upcoming auctions. Two of those have their catalogs online. Kestenbaum whose auction will happen this Thursday has some very nice pieces, including R. Hirsch's manuscript on Devarim est. $50,000, you can view the catalog here. And Asufa will have their auction this Sunday the 26th, and their catalog is here. They also have some unique pieces, well worth checking out. The final auction is Jerusalem Judaica which will take place the 30th but unfortunatly their catalog is not online so you will have to find a store which carries it (Biegeleisen has it).