I have a Kindle 2 and I love it. The Kindle 3 has just been released and it costs less than the Kindle 2 did.
The one problem I have had is that battery life is greatly reduced by using wireless that is not 3G. I don't have access to 3G in my area, so I have to rely on the alternative. I get around this by turning off wireless when I have no need for it. I turn it back on to make a purchase or download the blog I have subscribed to. My battery lasts a really long time if I don't need the wireless.
I don't know what you plan to take with you, but the Kindle can be charged using a usb port on any computer. It can also be plugged into the wall. I have no experience with other eBook readers, so I can't give you a comparison, but Kindle is the oldest and best established of the readers. By the way, if you buy something else you may be able to get Kindle content anyway. Amazon has some free applications that will allow you to use the Kindle store and buy Kindle books. You might want to check those out, as well.
My reading needs are a bit different than most. In a little over a year I'm going to move to the Amazon Jungle and work with some indigenous tribes for an indefinite amount of time. I'm not going to be able to lug a bunch of books around and I won't be anywhere near a bookstore, so I'm thinking an e-reader would be the best option. Battery life is a big deal because I will not have electricity and will have to use a solar powered charger. Right now I'm thinking a Kindle would be my best option. Should I be looking to buy it or something else now or wait a few more months and see what the next generation of e-readers brings?