As for buying books, I buy as many as I can. Getting info off of the Internet is nice, but really there are not that many credible sources for this type of stuff, and even if they seem like it, that may not always be the case.
Sure, but I'd say be weary of the older books describing non-western fighters, remember the iron curtain. Not all books are as reliable as you might mind think, getting their info from the internet or outdated publications
Having said that, there are tons of good titles, most of them are still great even when some chapters may be a bit outdated.
This is however going way off topic, this entire subboard is for books, and now we're discussing it all in one topic?
Maybe it's nice to start a topic called 'My Aviation Library' where everyone lists his a/c books?