[yingmi]

１．Pentax Optio S
２．DiMAGE Xt
３．DiMAGE X20

[hong28]

all are "no use"
you must use 7x-12x zoom DC
eg. Nikon cp5700, Panasonic FZ-10...

[Toilet_Paper]

I don't know if any consumer DCs are up to the job. Those typical high quality shots were done by SLR with fast 200 or 300mm.

[tam_dominic]

One of the DC list may be better than the other 2 but none is good for concert.

For lower cost (comparing SLR) FZ10 with F2.8 at 420mm is the best available.

If 5R print can satisfy you then a FZ1 can also do the job well at lower cost.

Happy shooting !