If you want a good device, try Kindle. You won't have so many options but those that are, works like a charm. The only limitation in a Kindle is ADE, that is not available, but you can purchase with your PC and de-DRM and send to kindle with Calibre in practically one step. Or you can install fbkindle hack and be able to read fb2, epub and chm directly with your Kindle.
I have a 903 but I'm not very happy with it. It is a good hardware but has a poor firmware, and it seems PB people is not in the work of improve it. Only if they publish all the source code to allow community improve the firmware I will be happy with them.
