Hi Chris,
You inquired about what my application for a keyboard would be, and it is solely for the purpose of midi-ing into my Yamaha QY700 music sequencer. It is a fabulous unit, for what it does, but I am not blown away by the internal sounds. I do have a keyboard, but it is a real cheapie (Casio CTK-541), and I use it mainly as a controller for my QY700. I also utilize the pitch wheel quite a bit, and - aside from the additional tones that the XP-10 offers - there is an onboard pitch wheel, which would prevent me from having to reach over to my sequencer for the purpose of effecting that action. A sound module is indeed an option, with the realization of savings, though I would have to sacrifice the near proximity of a pitch wheel.
You also mentioned software, within the concerns of 'sampling'. Could you please direct me to some software that would be good for this? I would really appreciate it.
Nathan.