Am about to buy a Cherny piano from a someone who says it`s worth at least $1300 and she`s asking $600. I know nothing about pianos. This is anupright. From the little I can find on the internet, I`m not sure if this is worth $600. In the picture it looks like it is in great conditon cosmetically, and she said that it sounds fine (of course I`ll want to have it tuned after moving it)...Am I making a mistake? I want something that I can learn on and that will last for my grandkids. HELP!!! I`m supposed to get this in 2 days!