Never mind a J200 and an OM28; a fair few audiences couldn't hear the difference between a J200 and an BMW, but, as gillymor implies, it's not only down to the audience, its the one who's playing the thing that matters. Anyway, if you can't spend your money on instruments, what else is there to do with it nowadays? You can't take it with you although I've known a few people who've tried.