some very good advice here, especially about the "which one should i buy ?" forum.
segosarko, i am going to take a leap and imagine from your rather surprising pseudo that you are living in france... if you are in Paris, perhaps you would like to come to the next
MobileRead apéro where you could try out a variety of devices (i'm not sure we will have a BeBook though) and talk to users about their experiences.
if you are not in Paris (or France at all, for that matter), you could also take a look at the meetup threads in the Lounge (look for the red "meet-up" prefixes), to see if there is one near you. you can also post a message in the individual meeting threads (in english
here, and in french
here). perhaps there is a generous member living near you who could give you a demonstration. this might make it easier to decide.
all the devices have their strong points and i'm sure you will find one that you will love !