I don't think it's as bad as you think. Just use the 60mm f/2.8 for the concert and don't be afraid to use ISO1600.
That depends entirely on what you're shooting, could even be a single prime lens.
"More versatile" in terms of optics either means "worse image quality" or "much more expensive" (or both).
You shouldn't. You can already cover a lot with the 18-55 and the 60mm macro (which doubles nicely as a portrait lens). If you want a cheap telezoom, get a 55-250mm IS.
I wouldn't bother with the 50mm f/1.8 when you already have the 60mm.
thanks for the info. I haven't been sure if I could focus with the macro lens (haven't really tried much other than close ups with it) but it seems like a lot of people are saying it should be ok. Hopefully 1600 ISO will work too.