The three more authoritative editions are the Paderewsky (edited by Paderewsky, Bronarsky and Turczynsky) the Henle Urtext and the Vienna Urtext (edited by Jan Ekier).
As PeterHK and Rachlisztchopin said, the Cortot edition although not completely accurate is indispensable.
Finally there is an excellent edition by French scholar Edouard Ganache, based on the scores that belonged to Jane Stirling (published by Oxford University Press). Apparently Chopin made pencil marks on her scores just before he died correcting/modifying small details.
If you are looking for performance suggestions, instead of getting a highly edited edition, get one of the Urtexts suggested (which will have Chopin’s original fingerings) and this book:
Eleanor Bailie – Chopin: A grade practical guide (Kahn & Averril)
Best wishes,
Bernhard.