As soon as Varranger comes with its own high end soundsources... it will be the perfect module to add on top of a Synth workstation, Digital or stagepiano, or anything else that comes with a midi interface...
I remember having read your post concerning Mega samples put together by Norbert. I have the hard drive and all other sounds on DVDs that I had purcahsed from him. I will be using some of them in vArranger, but I hear that the four sound banks that Dan devloped are even higher quality sounds. I have not connected my Ketron SD4 yet, but if I use the SD4 for the backup instruments and combine in with some VST plug-ins for solo voices, I'd believe I would get pretty rich sounds.