I was oscillating between the basic Kindle and the new Paperwhite, but in the end went for the latter because the size and weight difference is fairly small, but the battery life doubles, and I like the idea of having more screen options (colour temperature, etc.). Given how long I'll keep it (probably 10 years!), the price difference didn't seem too huge to me.
Bear in mind that you may want to add a case, which will increase the size and weight slightly.
Bear in mind that you may want to add a case, which will increase the size and weight slightly.