505 is still a good choice, love the screen and the hardware design as well as the UI. It's very easy to navigate through your books and just read.
The only caveat is that it doesn't display ePubs fully justified, so you may find yourself wanting to use LRF format, which isn't currently sold at many e-book retailers. So there could be more maintenance required for book tweaking and conversions in Calibre. Otherwise, it's great.
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