I just finished reading through a yearly break-down of the Institutes and have used this Kindle edition for most of the year. It's very easy to navigate through. I highly recommed this version above the others for your Kindle.
In regards to the Institutes themselves - what can I say - probably the best systematic theological work in history. I like Henry Bevradge's interpretation best of the English versions as well - of which this Kindle version is. I know Calvin is most known for his sotoreoligical positions regarding election and the sovereignty of God - but I must say that the best discussion/explanation on the Trinity lies in the pages of this work as well. Just my humble opinion - but I have never seen Calvin's explanation of the Trinity and trinitarian doctrines surpassed by any other theologian.