How about all three? Most inspiring book you ever read, most influential book you ever read, best in terms of well crafted.
Sure.
That will satisfy all.
1) Inspiring Books...well, this will have to go to a whole series of short stories and books by this man...
The world's most prolific writer.
His short stories are sublime and reach out to all ages (I started reading them at age 9). He made many references to the past (which brought an interest in past literature)...but, if you understand him, and his context, in his more complex writings, he makes Walt and EPCOT look pale...and, he's far more influential than Lucas or Roddenberry, who both were focused on the popular (Roddenberry less so, but still a slave to it). Asimov just didn't care.
His Foundation Series is his most famous work, but what non-Asimov fans don't understand is that all his stories, from the short stories to the novels, tie together to make a larger human (and human future) narrative.
Far to much to say upon that now, but no one author has inspired me anything more than he has.
Were I to recommend him to someone, I'd start off with his Elijah Bailey detective series, and then move on to his short stories and THEN read the FULL Foundation series (Foundation and Earth is hard to find now, but it ties it all together)...over 20+ novels and nearly 300 short stories...
Just epic storytelling. And an epic and introspective view.
2) This goes to something that is a rather silly book. It's by Ken Blanchard, whom I think is largely an opportunist, but even opportunists can be savants! This one that has to do with how to manage people. There are tons of management books out there, but I think "One Minute Manager" and more specifically (the book I chose) is "One Minute Manager Meets the Monkey".
The books are written simply, and rather short. And yes, they have to do with management...and normally I hate those style of books (Good to Great is quite interesting as well, but not as practical as One Minute Manager Meets the Monkey"...
I won't get into all the lessons taught in that book, but for me, it's a very influential book that should be mandatory reading for anyone in a position of leadership.
3) As far as the best put together, I'm gonna have to give that to Harper Goff with To Kill a Mockingbird.
A close second would be Steinbeck with Of Mice and Men...but, I really think Goff captures and simplifies (yet explains so well sub-textually) various social issues.
Hands down one of my favorite book.