I've been reading through the forums for a while now and decided on an Anglo for my first concertina. From what i've read, the two best choices for a beginner would be a Hohner D40 tuned by Button Box, or a Rochelle. Having said that, if anyone currently owns one of those and has since upgraded to something beyond introductory level i'd most certainly be interested in purchasing a second hand version to start out.
....Or is it likely that i'll inherit a plethora of problems by purchasing second hand?