Not a fan of Ebooks at the moment, they are overpriced devices, and the ebooks that go onto the devices are very overpriced aswel, on many occasions i have seen digitally produced books more expensive than books that have been printed onto paper.
Avoid buying an Ereader for now until the hype dwindles and they start to retail for respectable prices.
The solution is to buy yourself a Netbook - they come with Wifi, ability to play video/music, basically everything the ereader's cannot do... then install yourself Adode Reader on the netbook.
You'll find Ebooks in the pdf formats to be cheap if not free.
Alternatively: scan the books you currently own onto the netbook?
Ebook readers are a no-no, there are mobile phones that can already read ebooks