For those with a tight budget, the Tamron 19-35mm is pretty useable, and sharpness is better than the kit lens. I am still using this lens. And you can use it with FF or film SLR, which why I am still using it. The only bad thing is the focusing speed is a bit slow.
However if you have a bigger budget, the Tamron 17-50 f/2.8 would be a better buy for your camera.
hmm i would like a 17-50 too but the price is doubled of it. the lower f2.8 is much better too i know, but i would prob use it more for landscape so lighting and time isn't really an issue i guess...??
but since i'm not in a hurry to buy maybe i'll just save up for the 17-50 too... good? hah