Well it won't be really an upgrade as we don't have a similar digital piano. We have a harpsichord and my wife wanted to get a piano as well but to tell you the truth, the ability to wear headphones or turn the volume down are almost necessities when our children would like to learn to play or my wife wants to play after hours.
I want something that has a deal very close to the acoustic as well as produce a somewhat immersive experience. I tried the clp 745 but wasn't impressed by the sound.
The CA901 would be a great choice (about 600 less than the 885) but the quality control seems quite problematic with often reported clicking keys and there is no local person for easy repairs. So I am heavily leaning towards the 875/885.