I just went through this conundrum a while back. I tested every single keyboard possible (I needed a secondary keyboard for programming, not for piano playing).
I ended up buying the komplete kontrol. It's not perfect, but, after my research, it's definately the best in the market. But, it has it's weakness.
The main reason I got it is because the key bed is awesome and the mod wheel's feel and layout.
I was not too into the komplete integration, but, after I got it (just because it's for sure the best key bed) I started testing all the spitfire symphonic orchestra and I was blown away by the flawless feedback between the vst's controlls and hardware controller.
This komplete kontrol totally makes useless a motorized fader system, plus ALL, and I mean ALL is mapped for you.
What I mean with feedback is that if you move lest say the easy mix fader on a knob then all the mics will update in real time in the screan. So, you get totall feedback and no jumps between switching tracks.
The downside is that it doesn't work in an instance of vienna ensamble pro hosted in a slave machine.
You are also limited to load single instrument per instance of komplete kontrol. If you are fine with this, then, this is your guy.
In my case I have limited use, because all my instruments are in a slave so I use it most of the time in midi mode. The downside of this is that the knobs are just simple endless encoders. They are stable and don't jump when switching tracks.
Another downside is that when in midi mode, the transport buttons and main navigation knob are turned off and turn into a lot of useless space. I don't know why they did that. They should be mapable.
You also have the akai advance. Has the vip software, but, it's not as stable as komplete. The mod wheel layout is a big negative on this one. See the akai forum and you will see.
Lastly, in terms of features and prise, you have the maudio ctrl 49. It has the layout and all features needed. The downside is that the keybed is relatively basic compared to the kontrol. It only features a steped curve. If you are not into too much fast playing, this is the one. It also uses vip software.
NOTE: the scales and chord mods only work with a fully implemented nks instrument, as far as I can tell.
Without the kontrol software, it really is a brick. The arpegiator works, but, is kind of a hack.
Good luck.