Big thanks for the work in the forum,i'm having great time learning here 
i've a 550D,for my first lens purchase i'm looking for 17-50 & 70-200 2.8's
i'm looking to get :
main lens : Tamron 17-50 2.8 Di-II Or 17-50 VC ver - heard alot of great things about the new sigma is a bit $$$$ for me-
which is better?? some say the VC isn't as sharp,but i found mu self shooting in low-light alot,though i get nice sturdy shots with the 18-55 canon kit
so is it more likely -or practical- to use slower than 1/50th,that's the only main reason to get the VC -if there is another IQ + let me know-
Or get the Tamron 28-75 2.8
still confused
for the tele-zoom :
Sigma 70-200 2.8 HSM II : i think it's the one for me
, in the price range the is Tamron 70-200 and the older sigma 70-200
or a canon 85/1.8 ??
and i'm looking to get the nifty 50/1.8 as well
any thoughts or suggestions , feel free to share 
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