Starting Litecoin mining with 10 GPU need some insights!!

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http://forums.anandtech.com – Hello Guys i am new here .. I am planning to start litecoin mining with 10 gpu(2 rigs of 5 gpu each ) .. But i am confused with which gpu i will go and profitable for me .. This is what i was thinking .. I was planning with hd 7950 , but some peoples told me XFX ATI Radeon HD 5970 black edition is also good option .. I am getting HD 5970 black edition in around $276.23 each so around $2762.3 for 10 pieces .. and getting hd 7950 in $390 each .. so around $3900 for 10 .. I am getting these prices in India (Currently living in India) .. Or any other card which is good for mining a (Hardware)