Thieves World, though since I don't know exactly when it is coming out I probably will end up buying some things at Origins. But I really want Thieves World.
My most immediate [needful] purchases will be: Serpent Kingdoms, Shining South, Lost Empires of Faerûn, Waterdeep, DMG II, Complete Adventurer and Complete Warrior
DMG 2 and the Waterdeep book. I also have Campaign Cartographer 2 & DM Genie sitting on my wishlist at RPGNow that I need to purchase for my laptop someday-
Iron Kingdoms World Guide and/or Black Company Campaign Setting. I've had my eye on the two of them for some time, and due to one thing after another, I haven't picked up either yet.
Warcraft Manual of Monsters pdf and the Twin Crowns Ritual book (I forget the name) pdf.
I have the hardcopy MoM but want to cut and paste. And I like the twin crowns ritual system from their campaign setting and Broadsides and want more, especially the alternate materials rules for them.
Then in August probably the two Everquest rpg monster books in pdf for the high level monsters to be in a copy and paste format for me.