Can anyone help me choose a beginner's electric piano for my daughter (and myself)?

How much should I pay?

Do I need 88 keys?

Currently looking at

Casio privia px-s1100 (the red model is so pretyy)

Yamaha p225 (these sounded best to my ears, but I don't dig the design)

Rolan fp-30x (like the sound and the design, but dislike the volume adjustment)

Or should I look for something xheaper? Or more?