Are you in the US? Are those $ figures in US Dollar? How well can your son play right now? (What RCM or ABRSM grade, or what pieces he's working on right now?) How well do you play yourself?Assuming you're in the US and those numbers are in USD, check out Yamaha C2, Estonia 168, and RX-3, and Petrof III in addition to Kawai RX-2 and Petrof IV. Assuming the dealer prepare those instruments properly, ANY ONE OF THESE will be more than adequate to support your son's piano education all the way through college or even graduate school (if he sticks to piano that long, and you keep up with the piano's regular maintenance). Which among these to pick is a matter as personal taste -- listen to them all, and just pick the one that sounds best to your ears (and cost the least money to buy if they "just as good as each other" to you).Depending on how competent your son is as a pianist, he can help you play/listen/judge the pianos. If you don't have enough confidence in your son's skill/discernment just yet and you do not play yourself, find some other pianist in whom you have more confidence and get his/her help (e.g., your son's piano teacher might be a start). The pianist does the playing, you do the listening and judging.ANY of these piano will do, there is no wrong answer, just get the one you like best, and the one that cost you the least if you find yourself liking a few of them about as much.Good luck. (There may well be other options around that price range, I list only those I've played.)
Yes, we are in US and the numbers are in USD. My son is a beginner who has been taking piano lessons for almost 4 years. Right now, he has Kawai upright. Do you think a beginner needs to play on a grand piano like those?
Some one asked: "For a beginner, child to adult, what is the minimally acceptable piano required to start learning and progress to a point that a dream piano is worthwhile and recommended?"