So I'm desperate to get a new lens for my cam (3 actually but 1 at a time)

Could I have some views please. Either views in experience or just from your outstanding knowledge or you could even do more research for me wink

The lenses in question are:

Sigma 17-70mm lens for digital SLRs   vs   Canon EF 24-85mm f/3.5-4.5 USM

Sigma 10-20mm F4 - 5.6 EX DC HSM   vs   Canon Canon EF-S 10-22mm

 Sigma 50mm f2.8 EX DG MACRO  vs   Canon EF 50mm f/2.5 Compact Macro

And the question is - should I be looking at Tamron lenses too?

Thank You in advance for any help.

P.S. Cam is a Canon 350D

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