Save yourself some money and buy the Casio PX 560. No iPad or apps needed because everything is onboard as it should. Great allrounder with everything you need.
Except for style quallity, i still hink the casio styles lag the yamaha and korg ones by atleast a decade... mostly because of the orchestral sounds (except for strings) and guitars and basses and drums...
Piano, organ, dp, strings, synths are top tough..
And while the keyboard action is acceptable... its no match for the pha50 amd NWX...
But then thats just my opinion..
In the end both the Roland and the Yamaha are in another league, but then they also are a priceclass higher..