If you haven't read all three, its well worth your while to do so!
And of course if you are going down the rabbit hole of reading Perls of Functional Algorithm Design then you need to read the "how to read Pearls of Functional Algorithm design" as well.
Seconded! Also, I'd highly recommend "Introduction to Functional Programming using Haskell" by the same author. This was the book that set me forth on the path of FP during post graduation. Though, professionally, I've been programming in Java for close to a decade now most of the FP principals have held me in good stead.
[edit] Preface says "The present book is a completely rewritten version of the second edition of my Introduction to Functional Programming using Haskel" so my recommendation is moot.
[edit] Preface says "The present book is a completely rewritten version of the second edition of my Introduction to Functional Programming using Haskel" so my recommendation is moot.