Re: Kindle/ordinary books
I got a Kindle fairly recently. I use it exclusively for non-fiction, as I get my fiction either from the library or charity shops. I like to read a chapter or so before making a decision on getting a book, as I am extremely fussy about fiction, and only read the occasional novel.
My friends keep telling me about the cheap deals you can get on novels for Kindle, but I'm not interested, I only find a novel I actually want to read about once or twice a year.
I do find the Kindle extremely useful for non-fiction subjects I am interested in, though. I spend nowhere near the amount you mentioned on books. Probably about £15 or so, averaged out.