Best Rock Concert Camera

Hello,

I have interesting in buy a camera for take pictures of Rock Shows in Brazil .

We don't have god prices for SLR/ prosumers cameras, and because of this I don't have enough money to buy one of those.

I was thinking about buy a semi-professional ( or UZ) temporarily . I have a Fuji S5100 but that camera is the worst one to take pictures without flash and using high ISO or P&S modes.

Can you help me? What camera should I buy? Nikon L110 is a good option? and Sony H20? And the Fuji ones?

You can see the pictures that was taken with my Fuji S5100 in here :
http://www.flickr.com/photos/elisaramos/

thanks a lot !