Good luck Bernie. For me, 3 years and counting, the 3x has been a real joy and I long for nothing more. The 4x should be everything you'd ever want.
Plus one, got my Pa3x in 2012, it's the longest I've owned one arranger, I guess? Also used the Tyros and PSR series since 2007 so that may count.
Bernie, Congratulations on the Pa4x-76!