About admission in IIT's?

I am selected in IITJEE 2011 and according to my rank i may get admission to B.Tech chemical engineering at IIT Kanpur or delhi or madras.Also there is a chance for me to get admission into dual degree course in chemical engineering at IIT Bombay. But I'm confused. I want to know whether it is better to take admission at above institutes or to try for a good branch like Electrical Engineering or Computer Engineering at IIT Hyderabad. Please help because I don't want to let a good chance go away since I have been qualified with just self study without any coaching class. Also I am confused about future opportunities or jobs if I join IIT Hyderabad since there has been no campus placement yet.