To help the thread starter: Yamaha also does the P-121, which is the same as the P-125 (so as you rightly noticed, very similar to your P-85) but with one octave, 2 kilos and about 20 cms less.
If I end up not buying the 50 pound P-515 the P-121 is my next choice, unless i can find a used CP4.
Thanks for the responses, really great information. I'm still kicking it around in my head. But at this moment I'm leaning towards the P-515.