Love my Kindle. my son has one, my niece, all my friends
I have read on the nook and the ereader (sonys brand I think) and a girl I work with has a Kobe.
I think the kindle by far is the best. Good luck in your search. My advice is go online and look at the reviews and options they have. I searched and read the internet for weeks before I bought my kindle. That was about 3 yrs ago. I have read on it almost everyday since. Tons of free books out there. and if you dont like the way a pdf file reads on the kindle.. you only have to email the file to kindle and they will send it back in kindle format for free.
I have said many times. If my kindle breaks I would by another one that same day. They now sell them at several retail stores. Good Luck