I use an iPad for comics. It is fairly heavy and pricy, so this might not be the solution you are looking for. But ComicX is just great (I absolutely love the way it transitions between panels... if you have not experienced reading a comic book like that, you absolutely have to try it...). And I use iBooks for all the PDF comic books I have collected over the years.
This might be a bit off topic... but, despite reading a lot of comic books on my iPad, and despite absolutely loving ereaders (I use a SONY PRS950 as well) for books, magazines and work-related PDFs, I just like to buy, collect, store comic books. This is one area in which an ebook reader just doesn't do it for me. But heck, I love the fact that I can finally get the latest Dylan Dog without having to get it shipped from Italy...
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