My best advice.....
Make a list of books you'd like to read
Look at the
Amazon and Barnes and Noble book stores to see which book store offers the best selection and best pricing.
You will find people to sing the praises of both. Do your own research and figure out which one will work best for you.
Amazon has a Kindle discussion forum (which is highly searchable). There are 100s of discussion threads about the merits of both.
The Kindle discussion board is here:
http://www.amazon.com/tag/kindle/forum/ref=sv_kinh_6
After reading all of this information and being dazed and confused....my advice still stands.
The bottom line is that you are getting a
reader. You are going to want to buy books.
Figure out the best supply line for the books you want to read and that will give you your answer.