I will heartily second reading Eckhart Tolle instead of a whole lot of different spiritual books - he gets to the heart of it all without the needless digressions. Next to it J Krishnamurthy is good if you want to go deeper. But yeah after you've read Eckhart's Power of Now you should not feel like adding more knowledge to your self :)

To me PoN was a fundamental shift - in the way I think, the reasons that prompt me to think, the decisions I make, everything. I found the concept of utilitarian thinking very helpful in terms of actually being able to stop useless thinking - if you keep a bit of consciousness always in the background and ask - what is this thought giving me, is it changing my circumstance - that to me is a huge balancing force.