I cannot imagine the KA17 to sound any better than the KA11.. those are both transparent DACs and high impedance headphones shouldn't be affected much by the differing output impedance of those "amps"..
looks like what you're looking for is definitely NOT a DL200, so it's probably better to move this somewhere else, though.
From what I've gathered here, if I was you, I would simply get a FiiO R7
This is a review and detailed measurements of the FIIO R7 DAC, media player, headphone amp and streamer based on Android operating system. It was sent to me by the company and costs US $700. As you see, you have the equivalent of a normal Android phone screen. It is impressive in size compared...
www.audiosciencereview.com
It's ridiculously good, has a display with touch, a remote.. a big and nice volume knob..
You wouldn't even need your phone anymore and could just stream straight from your bed with remote in hand.
Could also get a FiiO M11 for 200-300 bucks (barely used on ebay) and ditch the phone, too..
portable DAP with Android interface, streaming integrated, strong amp, great DAC, etc. I honestly don't see the appeal of having a big device next to my bed..
(Okay, I have a B&W Zeppelin on my drawer with a WiiM Streamer connected to it.. but that's different.. It's a stereo for the bedroom with the phone as the remote)