Kobo Clara BW eReader. RRP around $250, $50 off with their eBay discount code. They also have the Kobo Clara Colour, Kobo Libra and some package deals including covers. Look at their eBay store to see what else they have.
The Kobo Clara BW is the same size as the standard Kindle, but has a feature set more similar to the Kindle Paperwhite (except for size)
I've got an old Clara HD which I love, mostly for the ability to borrow library books via Overdrive.
Is there any real reason to upgrade?