Hi Mirax,
I will echo Yelvertofts thoughts re the Sigma 18-125mm. I have to agree, it's not a lens I would go for either. It never quite achieved what it promised by normal Sigma standards.
From the ones you've shortlisted. the canon 28-135mm is certainly one of the better ones.
I've been pleased with my sigma 24-70mm f/2.8 as a general lens, but it certainly isn't small or particularly light weight, but it's the price you pay for a full frame, bright lens unfortunately. Nice and quick AF too with good macro capability, Many go s/h on ebay for a reasonable price of around the £150 mark.
There's some real s/h bargains around.
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primarily using Nikon film and digi kit, and some micro 4/3rds gear for experimenting with old lenses
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