I have exactly the same setup as yours. MB on C drive, music files on D drive. I have a folder named "inbox" on D drive and store all not-ready-for-library-yet files in it. I also have "New" subfolder inside "inbox" folder, and all newly purchased/ripped files go to that folder. Once all tagging is done in inbox node, I send them to library, and they get auto-organized into "Music Files" folder on D drive.