Advice for buying a new MIDI keyboard?

[FatherSonAndAlcohol]

Hey all,

I am planning to buy a new keyboard next month, and I have singled out the following three:
1. Novation Impulse 49
2. Akai Professional MPK49
3. Roland A500 Pro

I will be using this more with Reason than with Ableton, but I will surely use it with both DAWs.

If anyone who uses/has used any of these has some tips or general knowledge to share, it would be greatly appreciated.

Thanks.