[tannenba]

Another option - if indexing isn't of value to you, at least on the K3 it is pretty easy to disable it by entering a magic command in the search box. Do a search to find the thread on this site that gives the specific instructions. Once indexing is disabled, doing a kindle search only looks at titles and author names, not inside book content. With 1400 book loaded, maybe this is just what you want. What I don't know is if disabling the index can be done the same way on a K4 as on a K3. Enjoy your Kindle!