John, As a piano teacher who happily uses the SD2 for midi playback, I would not recommend a controller in your situation. The SD2's piano sound is just not a good as the multi-sample sounds in today's Roland, Yamaha, Kawai, Casio DP's. It sounds as though you want portability, so I'd recommend trying stage/slab pianos from those companies.

I recently bought a Kawai DP myself but it's a console so probably wouldn't meet your needs. For very good bang-for-buck, I'd say take a look at the new Casio's which are being released this week in the US and I assume Canada as well. The PX-130 will be around $500 USD and the PX-330 around $700 but stands and three-pedal attachments are extra. There are pros and cons to these. PM me if you and your wife want more info.

Meanwhile, I'd suggest the two of you do some reading at the Piano World Forum's DP thread.

http://www.pianoworld.com/forum/ubbthrea...20&%20.html