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For this use, I would probably go Android tablet. Wide variety of screen sizes and high dpi resolutions available. Fast CPUs and fast display response make reading PDF far more convenient and comfortable. Lots of options with expandable memory (although declining over time). More convenient for sideloading. Typically have tough to scratch screens versus ereaders with their plastic top layers.
You can run many different reading apps so you can belong to as many or as few ebook ecosystems as you want.
The sole cons of the tablets are possibly higher cost, and the eye fatigue issue.
For ebooks readers, PDFs tend to have text that is too small (assuming the PDFs were generated for view on PC originally) unless you downloaded them from Feedbooks or somewhere similar. If the PDFs are actual scans then the size might be OK, especially if you briss them first to crop the margins. However, most ereaders concentrate on having long battery life so the CPU performance (and hence page zoom and flip times) are worse. For how much worse, you should look on Youtube and see if anybody has done a demonstration video.
Out of the choices you present:
KAO
H2O
I like the Auro One more. The slightly bigger screen works well and the overall industrial design appeals to me. Software is pretty much equal. I personally am almost never in a position to get an ereader wet so the water proofness isn't a large selling point to me. You should go on the Kobo area and see if the hardware niggles have been worked out yet.
Not as flexible as a full on Android tablet, but there is a good sized hacking community.
Kindle Voyage
I think the strongest argument for the Voyage (Amazon's book store and convenience buying from them) doesn't apply in your case. It does have the virtual page turn buttons but that makes the device large for the size of screen it has. I think a 6" screen is going to be a little small for you, depending on the exact makeup of your PDFs.
Much lighter than the Kobos. Depending on how you hold it while you read, and how long you read at one time, this could make a difference. But if you don't have a chance to compare them then probably won't be important to you.
Inkpad2
I have never seen an Inkbook, so I'll have to let a European member address this. I will say that from the photos it looks about iPad size and I think I would find that difficult to hold for long reading sessions.
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