The Kindle DX is now $259. This is the Kindle DX 2 – the one with the eInk Pearl screen and graphite casing.
You can see my Kindle DX 2 Videos to get a better idea of what you’ll be getting.
Main advantages – eInk Pearl screen, much larger 9.7″ screen, all the Kindle ecosystem benefits, syncs with Kindle Apps and other Kindles. The product page lists all the benefits.
Main disadvantages – Kindle DX hasn’t been getting any software updates, the size is a bit unwieldy, the weight is a bit much, its not a latest generation Kindle, no touch, PDF support is not that good.