I bought a Kindle DX (the largest screen Kindle model). It works really well for music sheets without sucking up heaps of battery like my iPad. 🙂
I’m planning to make it my main music sheet repository as well as storing some manga on it.
Interesting thing that I didn’t notice about it is I get free 3G wifi web browsing anywhere in the world. So that means I could use that net connection in the built in browser to use twitter, facebook, email while in Japan without paying crazy roaming prices!