Rikki,
congratulations!
An important difference between Ketron and Korg is that with the SD1 you are limited to monophonic loops, while Korg can use stereo waveforms as well. This feature really sets the PA-800/PA2-X Pro apart and I think that they can give also the forthcoming Audya a good run for its money.
Speaking of that, a BIG difference between Korg and Ketron is that Korg has the human and financial resources to develop this and other features much better than Ketron.
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.