Yes, here are my thoughts. If you are an avid reader as you say, then an eReader of some sort might be exactly what you need. But it might not. Let me explain.
My husband and I both love to read. We both gave each other Kindles for Xmas. (we didn't know, but our kids did, lol). Anyway... the Kindle is great for reading. The battery life is LONG. It really will last a month without having to charge it if you are using it pretty much exclusively for reading (downloading a book here and there and reading them). When you start trying to do emails and going online (which you CAN do with some limited ability on the kindle, but it is more hassle than it is worth, imo), then the battery starts getting drained faster--JUST LIKE the other types of tech that you can buy (pads, laptops, etc). Anything that goes wi-fi uses the battery faster and needs recharging more frequently. For ex: Both our kids recently received ipod touches. Daughter's was using a LOT of battery-- needing to be recharged more than once per day. Why? b/c she had the "push" feature on--so that it constantly checked for emails/updates/etc.
SO, that said, if you are going to use your device as a BOOK, and you will not NOT buy the books (sometimes they are not cheaper to buy digitally compared to just buying a paperback), then an eReader is wonderful. BUT, if you think you will end up not buying many books due to cost, then if you want a "device" I would get a device that you can do other things on. Because you can download a Kindle app or other ereader app to download and read books from THAT device. If you'll end up using the apps and such then the battery will require much more frequent recharging (daily or more? depending on the device), but if you aren't using it solely to read on, then you will know and remember to recharge it frequently anyway.
Is this making any sense or is it a little convoluted? Sorry...
But there IS a benefit to a dedicated device for eReading-- battery life/portability. So it depends on how you think you will ACTUALLY be using the device you purchase.
My husband thought I would prefer an Ipad, and told me not to open the packaging if I wanted to return the Kindle-- but I didn't want to spend another $400 for an iPad, PLUS all the accessories that I would want/need (to keep it protected). And I am NOT someone who wants to be plugging up to charge the thing all the time. The Kindle fits in my purse if I need it to. A pad or laptop won't.
So imagine your actual use and carrying the item around with you. Then go from there.