First of all, congratualtions on getting selected in IIT JEE -2010.
If you don't have any specific branch interests, I will suggest go for reputation of institution. A good institution certainly helps you in shaping your personality and opens a world of opportunities for you. So in that case, IIT Kanpur should be your choice to go with.
Hope this helps to answer your question.
Please feel free to post as many doubts on our disucssion forum as you can. We are all IITians and here to help you in your IIT JEE preparation.
All the best!!
Ankit Jain- IIT Bombay