photozone.de for comparisons on a lot of lenses for each major camera system, new and old.
I'd avoid any cheap sigma lens Tel, only go for the EX range. The build on a few of them is a bit plasticy, but the sharpness is usually as good as if not better than the big name lenses at most of the zoom settings.
Tokinas atx pro range is a good choice as well. Good prices, great build (but heavy), great results. Only issue i have is the MF/AF function, bit poo to switch between them. I have the 20-35 2.8 which i use a lot and its a crackin lens.
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