First of all - tnx for your option. Right at the moment I think that buying a separate MIDI controller is out of budget limit.
Just looking for a nice keyboard and ignoring "out of the box" controller integration with CbB I would probably go with the Arturia KeyLab Essential 49. It offers support for "Mackie/HUI Control". Does that mean that I will be able to manually config the mapping to enable the transport controls? Is there any good tutorial or video guide available out there? There are so many technical specifications, different standards, abbreviations... it's really hard for a beginner to even know how to ask for information or what to look for. Oh man - either this is really complicated or I am just to stupid for it.
I really think that the Roland A-300 Pro would be my favorite even when ignoring CbB integration. I heard it offers nice build quality, good keybed with aftertouch, good dynamic response... I only fear that it is a rather old, outdated product and I find it dubious that I need a special driver to even get it to play.