Hello, I have recently sold my nikkor 18-70 AF lens. I am using my friends extra 18-55 for now. I was looking to buy a lens around the $300-500 range. I was looking into the nikon 18-135, Tamron 18-200, and the sigma 18-200. I am still very new to photography. Could someone point me in the right direction of a new lens. Give me some pros can cons about my choices! thanks! *I am looking for a good all purpose zoom lens, wide angle is a must.