I'm going to throw a little curve here... If your focus is on simplicity and you don't want to be overwhelmed, you might find even a lower cost model will do what you need. Maybe it won't have the same quality/quantity of sounds, but if the simplicity makes the board more enjoyable... well, an okay sounding board you actually like to use is a whole lot better than a better sounding board that you don't. So, in that spirit, check out this video:
And if you later decide you do want something with the sounds/features of one of those higher priced models after all, these being so inexpensive to begin with, you won't take a huge loss (in absolute dollars) if you choose to trade it in or sell it if and when you're ready to upgrade. But otherwise my concern would be that even the PSR-SX900 and PA1000 won't necessarily be simpler than the Genos you found too complicated, and so you might find those frustrating as well.
Also, besides looking for videos to compare the sounds, you might also want to look for tutorial videos that walk you through the operations, to compare them from that usage perspective, too.