I use my Logos Bible Software about every week. It is a great help because I have a ton of resources in it but also because I can take all those resources with me on my laptop. It is a pain to take a study Bible to a coffee shop much less 5000+ books. Anyway, if you are thinking about Bible software Logos just released version 4. It looks like a good upgrade but I wish they would work all the bugs out of the Mac version that just came out.
Check out all the book at http://www.logos.com/upgrade