After much investigation work and advice from this forum I went to my local Jacobs store and tested the Canon and Sigma that Clive suggests above plus the Tokina 12-24 (I think). I ended up purchasing the Canon as in the test shots I did at the store this was the best lens. It is also worth pointing out that I bought the demo lens as the quality of the results from the boxed lens were inferior. Just out of interest I gave the 24-105 L lens a go and the 10-20mm I bought was streets ahead of the L.
So to summarise, what I am saying is that each and every lens will differ. Possibly not massivly but there will be a difference so if you can then do what I did. You may well pay more than at Wharehouse Express but I certainly considered it worth while being able to choose an exact lens.
Hope this helps and enjoy choosing!
Paul
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