Lens recommendation

1eyewillie1

Hi, I wanted to find out what type of lens you would recommend for taking pics of products (model cars, watches, jewelry, small purses,etc.) to be displayed on either e-commerce sites as well as Amazon and Ebay. I have a Canon 60D + 18-135 mm f/4-5.6 IS II. I have a Cowboy Studio table top tent with lights. I want the pics to come out professional with a seamless white background and a crisp macro image. Anything under $500 would be great. Thanks!