Norton1, this not so short article may be of some help.

When we were looking for a reasonably priced vintage one, many years ago, it was recommended that we make sure that we find one with a steel harp, rather than one of wood, because the wood ones were a bugger to keep in tune. Personally I like Nordheimers and Heinzmans, but here are many others, highly recommended in the article.

Had I known that we would move our Nordheimer for our daughter, three times in the past year, I think we might have reconsidered and looked for an electric piano instead, many years ago.