Yea I've always wanted to learn to play the piano and violin. Couldnt afford it before now and loving it at the moment!
P120 and P155 sound really nice and loud. P70 is a good starting point if you aren't sure if piano is your cup of tea, or if you just want one to practice techniques till you can afford a better piano

But if that's the case, any weighted 88keys piano would suffice. I personally feel that it is more important to get one that feels as close to an acoustic as possible when starting out. Sound becomes important only in later stages
But yea, I would defn encourage you to live your dreams!