Funny you should say that lotharbucheim, here in New Zealand i just brought The U-boat wars book of Trademe online store a few days ago for $9 and am waiting for it in the post.
Another good uboat story ive read is called "Far from Home," The Epic voyage of U-862 an IXD2 that sailed around the Australian and New Zealand shores, and survived the war. Also HIRSCHFELD The secret diary of a U-Boat, by Wolfgang Hirschfeld is another classic.