As far as Android tablets go, Archos is probably your best bet.

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Ebook reading wise, I'm thinking there are two different categories here:
1. E-Ink based solutions, like the Kindle or several cheap knock-offs from China. These will provide a nice "paper-like" experience, good battery life, and typically a larger size page.
On the negative side, you will need outside light to read by - Which is fine, if you read in your living room. If you read in bed before going to sleep, however... Having a backlit screen reduces eyestrain and aches from trying to hold the screen at an angle you can read from.
Also, the larger size reduces portability.

Tablet based solutions typically have shorter battery life, though these days this isn't as much of a problem. They also have active/color screens, which is useful in the case above, but not so much when reading outdoors during the day. Also, these can display video as well; making it a more useful device.
Tablet solutions are also smaller; it does require a bit more "page turning", but is far more portable - An Archos tablet, for example, can be stuck in a pocket - A Kindle? No way. This means that you could, for example, whip out your tablet while riding in a car or bus or waiting for something - Read a page or two. Or, as all tablets these days have audio capability, listen to music, depending on your preference.