I used the Trevor Thom books which I found to be very helpful, I can't comment on the other books because I haven't seen them myself although I'm sure they're very good too. Volume 5 in Trevor Thom is the one on the IMC, Night Rating etc so you won't need that right away unless you have intentions of going onto those soon after or there's a package price on the books and you're after some extra reading .
One book I would say is almost a neccessity is the PPL confuser by Neung Sorning (spelling?), a lot of it is EXACTLY like what you will face in the exams, so it doesn't matter which books you go for, the confuser will let you know what you'll be faced with in the exam. It has solutions for all the questions which is very useful indeed, look into it if it's available for the FAA PPL, I did JAA.
Hope this helps.