> By the way... which ebook would you buy?

If you mean reader hardware, for fiction a device with an e-ink screen of 5 or 6 inches is good (currently, both sizes have the same 800x600 pixels). Light, fairly sturdy, charge-once-a-week battery life, does not tire your eyes.

I have one of the Hanlin (branded BeBook) 6" devices, which I've been using on and off for almost a year. Fairly decent software (folders, formats, memorizes last-page-read, rare and harmless hangs/crashes).

http://feedbooks.com and similar sites have plenty of reading if you don't feel like paying hardcover prices for DRMed files. Head on over to http://mobileread.com for more opinions, facts and books than you can shake a stick at.