i live in Spain and where i live the piano stores are specialized on upright pianos and the newest models of kawai are the ca 65/95
As far as I remember, Spain is a big country---similar in size to Texas or France. I am sure you can migrate to another part of Spain for a small weekend vacation and try out the pianos in your price point at a big store.
Here is a list of music shops that deal in Rolands (from Roland's website): certified dealers in Spain
. You can probably find similar sections in Kawai's and Yamaha's Spanish websites.
The models you're referring to are over 1000 Euros, so a few hundred Euros on a train ticket or bus ticket or a tank of fuel will be well worth it.
One of the main differences in those models will be the amplification systems. You won't here the quality difference unless you try them out. The actions are all comparable---non of them are anywhere near the grand piano action in the Avant Grand---however, on a technical level, the CS8/CA67 action (Grand Feel II) is probably the best. However, the Roland action (PHA-50) is not far behind, and has Roland's modelled piano sound (although the LX7 is also not far off in price). You will have to hear those sounds to get a sense of which you like. Some people can't get enough of the modelled sound, others think sampling is superior. Nobody is going to tell you, you'll have to hear first hand.
Some people like the Yamaha sound: probably you will either like it or the others will be more impressive due to their better actions.