I have a GRPT 140. I think that that model still shows on GEM's European site, but has been replaced for shipments to the U.S. The 140 has a Detoa action for an acoustic upright. The guy I bought it from said that the retail was c.$7k. The new model is c.$12k.
The Kohler would be the most interesting for me, because I like a rich bass. That said, it's always tone, touch, appearance - to your ears and your fingers and your eyes. We often react differently on different days. I hope that you'll have time to do a second A/B of the Kohler and the Kawai, concentrating on the feel of their actions. Kawai's action is a premier one. If the Kohler holds up well to your fingers, that's a good sign.
The KD 140\'s
can be had for $3500 on eBay. They're being closed out and have been replaced by the 150's and 160's which Terry Wilson mentioned.
The Pearl is an attractive dark horse. Its bass speakers are a little small - tho still a little larger than those spec'd on Clavinovas - and you could add a powered woofer later. I like that they come with a three year guarantee. The model you linked to also has a distinctive cabinet and what appears to be a music desk which is similar to that on the GRPT. It'll most likely be flat against cabinet and when you raise it, a prop will flip out from down side, resulting in the appearance which is shown of their site.
The River is new, and their acoustics are considered to be very much entry level.
BTW, the touch settings on digitals - certainly on Yamahas - are a clever psycho-acoustic illusion. What happens is that as you increase the touch setting, the lower numbered MIDI messages are cut off. So, you have to press harder to get any sound at all and the dynamic range is reduced. The different settings are also filtered, which changes the tone. If you want to really use your digital as a piano, the lightest touch setting will give you the widest dynamic range.