Greg, you're looking to unload the KDX huh?
I asked a KTM mechanic last week about which bike I should consider upgrading to...200EXC, 250EXC, or 300EXC. With no hesitation he immediately said the 200. When I asked him why, he said that the tight wooded areas we have in NC lend themselves to the power delivery of the 200. He thought the added power of the other bikes would rarely be used in our riding areas, so the 200 would be the way to go in NC, probably in TN too.
Of course, I noticed that they had a 200EXC on their floor and not a 250EXC or 300EXC...not sure if that steered his comments or not. He did seem pretty sure of his response though.
While he may be right, it seems hard to justify all that added expense for a bike with the same displacement as what you (I) already have...whichever one you choose, good luck finding one, and post a ride report as soon as you can!