If it were me, I'd decide based on #1 key action, #2 the sound , #3 price, and #4 if you like how it looks in that order. You can move the priorities around.
I'm surprisedthere is not Roland model on your list. I think they have the best sound (with the new "Supernatural" piano)and arguably the best key actions
1. Yamaha arius ydp141-181(trying to decide if there is really a big difference between the 3 for the price)$1049-1599
Yamaha uses two different key actions, "GHS" and "GH". The 141 uses GHS and the 160 uses GH. Most people like GH better. The feel of the keys is very different you need to try each of them. A few are lucky and actually prefer the lower priced GHS keys. I bought the Yamaha P155, mainly because of the GHS key action. With the matching lp140 stand the P155 looks good. Maybe better than those others that are covered with fake wood
2. Yamaha ydp240 $1799
See above. Check out the key action. This is a GHS based piano.
3. Casio ap6(black polish) $2000
Is this just a PX130 in a shiny case? Do you need automatic accompaniment? You are paying $1550 for a case and auto automatic accompaniment. I think Casio is the brand you buy when you can't affor anything else. I just don't see the point of a $2,000 Casio piano, not when Roland has RD700 for same price.
4. Kawai cn32 $2000
I play on an older version of one of these now and then. It is a pretty good basic piano. In the past Kawia's sound was not great but this is improved and the key action is pretty good. Lighter then Yamaha'a GH. I still prefer my P155.