EQ Magazine says that the Native Instruments pianos are the best. Interestingly the most recent versions of their Steinway and their Bosendorfer are only $79.
The Line6 Stagescape is a very interesting idea. On the one hand it seems kind of childish to have a graphic of the band as your main screen. On the other hand, that might ultimately be very wise. I can imagine that especially in worship service pro audio that there's a huge problem with the competence of the sound operator and anything that can make it easier for them to not mess up the sound is a plus.