If you get pa3 you will be familiar with OS.
It does sound better than pa800.Basiclly you get everything you need for live playing.PA3 was made to be played live,not in the bedroom.You have a great sampler on pa3 and plus vl2.Yamahas vocalists don't even come close
But,it is up to you.S950 is good to.It was built for bedroom playing and nursing homes.