I do concert photography as a hobby. Portraits, though, bring home the bacon
Good idea to wait for the K30, since I'm sure it's just a few months away... I'll be holding on to my K20D till it conks out or the K50D comes out, whichever comes first...
The same photographer friend of mine likes the output of my K10D before too, but found its focus hunting in low-light irritating (as did I)... I swear, despite using the same AF system, the K20D focus a bit faster in low light...