After making a firm decision to purchase the 9000Pro, I've now began to re-think about which boards to buy as well.

For me now, I've got my sights set on the Yamaha Motif, and the PSR2000. MIDI them up together and you can control the drums from the PSR2000 and still use the fantastic sounds of the Motif.

Both the SD1 and the 9000pro are very expensive equipment, in my situation, I think it will be similar in price if I purchased a Yamaha Motif 6 (or even a 7) plus Yamaha PSR2000 compared to these 2 super-arrangers.

The Motif is very expandable, has excellent acoustic sounds, and will cost around 70% of the price of a SD1 or a 9000Pro. I think that's a very comparable solution.