I have been looking for a new master keyboard for a while. Visiting different stores trying to compare key actions of all options available when ever I've had a chance (and I admit I must have looked silly running around "playing" these without plugged into anything). What I have been looking for is a good semi-weighted action (that's right, it's what I'm used to), a mod wheel, pitch wheel, being able to plug in sustain and expression pedals (breath controller interface would be nice but probably to much to ask for). But so far I have not found anything that beats my old semi-weighted Roland HP piano in feel.
So I was thinking about going another route. Instead of getting a new master keyboard, maybe I should look for a box to extend my current keyboard? However, I have not been able to find any product that will sit between a MIDI keyboard and the MIDI interface and offer the features listed above (and maybe some additional knobs that'll send control messages but that's not really important to me).