Upgrade Lens HELP please

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Im finding myself looking for an upgrade from my kit lens 18-55.

I have a nikon D40 and D70s and i am looking for better glass and sharpness of the same specifications.

Ive been looking at

http://www.warehouseexpress.com/buy-sigma-18-50mm-f2-8-macro-hsm-lens-nikon-fit/p1020682

and

http://www.warehouseexpress.com/buy-sigma-17-70mm-f2-8-4-5-macro-lens-nikon-fit/p1020681

Is there really much different between the two,apart from the f.

Any advice appreciated.

Or any other lens you can recommend... ?
 
The Tamron 17-50 is better than the Nikon 17-55? :nono:

Sorry for my bad writing style. It should read

Tamron 17-50mm f/2.8 or Nikon 17-55mm are better than sigma
 
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