4 GB should be more then enough space for you. I know that Audible books has some type of connection with Amazon so that those books are available in your archive. What this means is that you can remove a book from your device but put itback on your device very quickly using the WiFi option or the 3G option, depending on which one you buy.
I would not buy an e-reader without some type of internet connectivity. Both my Kindles use the 3G option, I have not bought a K3 with WiFi yet, so I have no idea if I really need the 3G capability. I know that I love being able to download on the fly and buy what I want when I want.
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