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I hate to say this, but I doubt anything will be the perfect device for you!
For business documents and annotation you ideally need an A4 device with a fast processor, touch screen (and/or keyboard) and connectivity (wifi, bluetooth etc.) None of which are going to be very battery friendly. Install a large battery and you double the weight and bulk.
If you did have a top end A4 ebook device, it's not IMHO going to be well suited for novels. You want something you can toss in a bag, squeeze in to a pocket, hold one handed, read in bed, on the train, by the beach. This isn't an A4, touchscreen device!
After much soul search I deciced on getting a small 6" Sony reader (prs-505) which works great for reading novels, downloading rss feeds (thanks calibre) to read on the train etc.
It also does a great job with simple PDFs that I can control the margins of. I can read technical books (O'Reilly et al) acceptably well on it, and most library books (mainly in landscape).
For annoation I simply mark the page, and use an old-fashioned pad and pencil to write the notes. Easy, simple and at a fraction of the cost of a touchscreen device.
For complex documents, things I need to search, write major notes / annotations, I have my laptop!
If a perfect device comes out, I can sell my Sony and buy the new device. In the meantime I have a useable device that meets over 90% of my immediate needs!
HTH - Rufus.
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