I can't really help too much, but I can tell you that I started piano lessons with a very good keyboard, but (and my teacher said this would happen) I was only able to go so far before not being able to practice on an actual piano held me back and I had to quit. I was not developing proper strength in my fingers and my technique was just not able to keep up with the music I was learning. In the end it would probably have been better if I had not even bothered as I don't play at all anymore. Only positive was that I was able to play xylophone/glockenspiel in HS band without having to "learn a new instrument".
In my case we did not have space for a piano in the home, but modern pianos can be so small they barely take up more space than a full sized keyboard and prices are lower than they used to be, especially on used pianos. It's the key action that is most important and I have yet to see a keyboard that duplicates that well. Good luck with your decision!
