i am after a new lens for wildlife photography mainly, but maybe some sports too.

so far i am thinking of getting the Tokina 80-400mm f4.5-5.6 AT-X Lens or the Canon 70-200 f4 non IS. the lens will be used on a 500d. does anyone have experience of either or both of these lenses?

Any other suggestions? Budget is 500 max really, plus filter. i have found the canon for 480 from an UK seller on ebay and the Tokina for 399 on Camera Box.