Socrates never actually wrote anything, so it's hard for us to know exactly what he thought (we only get detailed accounts of him from Plato and Xenophon). To be honest, the same goes for Plato on the account of the nature of his writings, but I think most scholars say that Plato's earlier works represent Socratic thought and that the later ones expound his own views.
I have not read this and therefore am unable to vouch for its usefulness, but it popped up on an Amazon search: [ame=http://www.amazon.com/Greek-Philosophers-Socrates-Aristotle-Masters/dp/0192854224/ref=sr_1_1?ie=UTF8&s=books&qid=1231650445&sr=8-1]Amazon.com: Greek Philosophers: Socrates, Plato, Aristotle (Past Masters): C. C. W. Taylor, R. M. Hare, Jonathan Barnes, Keith Thomas: Books[/ame]
Judging by its table of comments, it looks like something relevant to what you mentioned in the OP. Unfortunately it's only available on Amazon Marketplace starting at $53. Perhaps you could obtain it through AbeBooks.com or a library (don't forget interlibrary loan).
You may just want to read a few of their major works. None of them are extremely long, though they're certainly dense. Check out Aristotle's Metaphysics and Nicomachean Ethics, and Plato's Republic, Timaeus, and Gorgias. Read Plato first, since Aristotle was his student and responds to some of his ideas.