New Camera with Lens question...

Hey folkes,

I just bought a Sony Alpha a230. I took it to a concert and got some photos of of the back stage action. Came out nice I might add....using the kit lens. Well when it came time for the show I went out and got my spot, about 30 or 40 ft from the stage. Wasn't a huge venue, was in a farmers market at night, with minimal lighting.

Well, the images I took were not that great in the low light and then were blurry as there was a lot of movement on stage. Also, lets face it...the kit lens is great for medium to bright conditions with medium to close distance and wide angle shots. But I wants some zoom and clarity, the kit lens just didn't get the job done. In a way I figured that would happen.

So my question to all you pros is what lens would be the best in a situation like that when money is a concern?

I do understand that DSLR photography isnt cheap. I just dont want to pay out the rear for a lens. I dont plan on trying to sell the images I take or anything. Really just for my enjoyment.