What is a good beginner (but good quality) keyboard/piano?

I really don't recommend that my students buy keyboards when they are starting out. I know it's a money issue, but music is an investment no matter how you look at it. At least get a cheap upright (maybe pre-owned?) from your local music store. A BIG part of learning piano is the FEEL. The muscle memory and action of the keyboard are CENTRAL. Your son's technique could suffer long-term (that's what happened to me. Fifteen years ago, I started on a keyboard. I still have some issues due to it).