I don't claim any expertise in this, but I have read dozens of PC-related books and have quite a collection gathered from used-book stores and libraries that get rid of old books.
In my opinion - hands down, the best ever written is Living Poor by Moritz Thomsen. It is a very real description of how a volunteer can try so hard and still never succeed. Thomsen went on to write (I think) 4 more books. I have read two and he is a very good writer although a bit dark.
Other very good ones, Peace Corps Profile, An Ongoing Affair, In Search of the Ever-Illusive PC Moment, Taxi to Tashkent, Nine Hills to Nambonka, River Town.
Some I thought kinda sucked; Under the Neem Tree, How to Cook a Crocodile, A Cellar in Afrika, Power Lines
Come As You Are is a good description of the first years of PC. It was soooo much better before all the political appointees took over. PC in the 60s was fantastic - such a pioneering spirit. Talk to some of those older RPCVs and ask them. Many were just turned loose for 2 years and checked back in right before they COSd.
I would love to hear other's opinions. I've always felt rather alone with my PC book hobby.