Is there something especially janky about KHE I'm just missing here? From what little I've heard the weird internal detangler thing looks kinda odd but works fine. I'm kinda diggin' the colors, too...had it up to my neck in ******** black, raw and brown. The KHE is also much more flatland-specific where the DK is still very much a 'missing link' somewhere between street and flat geometry (almost all 'entry-level' flatland bikes aren't flatland bikes). If you plan on riding any street at all I would avoid a purely flatland-suited frame for now, and stick with 2-pc over 8-pc bars with a little sweep since they can stand up to a little more abuse. Personally I rode a missing link for a long time, worked fine and then when I had the money and the opportunity my bike performed a sort of mitosis and two bikes grew out of it...one purely for flatland with a 19" Quamen frame and the other purely for street with the old Haro frame (now it's an S&M). After 3 years or so on a street frame, just dropping the inch or so and bringing the bike closer together made an ENORMOUS difference. I was pitching myself over the bars for weeks before I started to get my squeakers and shaky hang-5s back but it was *tight*. The bike was so much easier to move around on and to move around my body. The downside is, you can pretty much forget about riding street...flatland frames are squirrely (steeper head tube and shorter wheelbase) and just *tiny* overall.
The long and the short on the DK is it's a great bike that takes into account a little street riding now and again. If they're still shipping with the jankified Taska or whatever generic freecoaster is out there these days (the infamous Hoffman EP nightmare freecoaster), I would save my pennies and replace it with a Nankai or a Reloader at your earliest convenience. Even if it's not the one I'm thinking of, freecoasters are tempermental enough as it is without also being *cheap*.
I personally don't see anything wrong with the KHE (again, no personal experience but the specs look fine for what you're asking it to do), but it's purely a flatland bike...flatland geometry, 8-pc flatland bars (0 sweep), short reach stem and low-offset forks. It's also got a 36-hole wheelset, a luxury when you start grabbing your wheels in and repeatedly jam or rack your knuckles on closely-laced 48s. It's also over 100 bucks more than the DK, but for that I'm guessing maybe a nicer freecoaster (big plus, those things are expensive), and definitely upgraded brakes.