p'n's shoot camera for rock concerts?

[clapton is god]

currently i have a fuji Finepix a350 digital camera which i have been using when i've been to rock concerts and to be frank i'm not happy with it, slow blurred shots is my main prob with it.
i'd like to replace it with a better model which has at least twice the optical zoom and has an anti-shake mode.

i've had better disposable fuji take better shots- please advise .

 

[clapton is god]

yup, forgot about the low /dim light factor and if the acts have a non-pro camera policy, it also means please no flash when up close, so that's going to be a factor in my purchase.