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Congrats and all the best for your wedding coming up!
I have heard of many of these shops which have been given by the others, I guess most of them are good. I am recommending one that I have visited and helped some friends buy 2-3 expensive designer sarees for wedding occasion.
That is VARSIDDHI - at Balfour Road, Kellys and also at GN Chetty Road, T.Nagar. I believe they also had/have a sale for a week.