Sigma AF 70-300mm f/4-5.6D APO Macro with hood and 58mm Hoya HMC UV filter.

At it's sharpest apertures of between f/8-11, avoiding the very extremes of zoom, and either keeping the shutter speed high (ideally 1/500s) or using adequate support, the Sigma 70-300mm APO Macro can produce quite decent results: http://www.pbase.com/tuckeruk/samples_70300