Sigma 70-200s are actually pretty good if you get a good copy, they just produce more duff set ups than nikon would, so be prepaired to try a few in a shop.
I have a sigma 300 2.8
2x sigma fisheyes
have had a sigma 10-20 and the only one ive had problems with was one of the fisheyes i bought second hand.
also remeberd the sigma 300 shat itself the day I bought it second hand dead AF motor, guy who sold it helped pay though
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God made beer, women and Throttle bodies 
Last edited by Ryan; 3rd November 2009 at 19:50.
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