Headphone jack won't be good for listening while driving and I think adding portable speakers would defeat the purpose of a lighter device.
I did not realize that audiobooks only download using the WiFI, thanks for that info. I guess it makes sense, they are so much larger than an ebook that the data cost paid by Amazon would be larger.
I suggest the Kindle Keyboard because the touch Kindles do not have speakers and would not work for you.
You are not going to get light, mobile, 20 GB of space, and good battery life in one device. Your storage requirements probably lend themselves to a 7 inch tablet but you are not going to get great battery life. If you are OK with recharging every day or every other day, An android tablet would work well for you.
If you really want an ereader, you are going to have space issues. There are devices with memory card slots that can handle a larger memory card but having 20 GB of books can really slow down the device (at least that is what I have read).
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