Tallmomof2, do you prefer reading a novel with your K2 or with your KDX?
Personally, I prefer reading on the KDX, but it's a close call. The KDX is definately heavier, and I usually end up holding it with two hands, but when it comes down to it, I prefer the larger screen which allows fewer page turns. When it comes to books that aren't novels the KDX wins decisively.
One more thing, I usually read at home. This means I normally don't lug my Kindle around with me (unless I'm flying), so portability isn't that big of a concern for me. If you take your reader with you wherever you go then a K2 might be preferable. Didn't somebody say they carry their Kindle in their pocket? Their pockets must be enourmous.
BTW, my KDX's background is definately lighter than my K1.