TITLE: Which edition of Philosophiae Naturalis Principia Mathematica of Isaac Newton would you recommend to me?
QUESTION [14 upvotes]: I'm searching for a good edition of Philosophiae Naturalis Principia Mathematica of Isaac Newton in English. Which edition of the Principia can you suggest me? If it's possible, cheap and similar to original with the original proofs of Isaac Newton.
I'm sorry for my poor English, I'm just learning it.

REPLY [4 votes]: This 2003 edition by Densmore & Donahue has the following book review

Makes the great adventure of Principia available not only to modern
  scholars of history of science, but also to nonspecialist
  undergraduate students of humanities. It moves carefully from Newton's
  definitions and axioms through the essential propositions, as Newton
  himself identified them, to the establishment of universal gravitation
  and elliptical orbits. The guidebook unfolds what is implicit in
  Newton's words as he himself would have filled in the steps and
  completes the argument in ways that are authentic and not
  anachronistic, exactly following Newton's thinking rather than
  substituting tools of modern calculus or the formulations of modern
  physics. It is Newton in his own terms. This is a wonderful book.
  ―Richard S. Westfall