The Kobo is limited in what it can do. A Kindle,Nook, or Sony can do a great deal more and the Kindle and Nook are in the same price range as the Kobo.
I would suggest a Kindle or Sony. Both are international devices although I am not sure if the Sony is sold in India and I am too lazy to check. There are easy work arounds to buy books from US based stores so the Nook, Kindle, and Sony would all work fine in India. The Nook would be more problematic to actually buy and then if you had problems with it.
I love my Kindle, it does everything I need it to do and then some. I know that there are plenty of Sony and Nook folks that feel the same about their devices. Heck, the Kobo owners are pretty loyal. (winks)
It really comes down to what you are looking for in a devices. You are going to have to convert files since you have files that are EPub and Mobi so that is not going to help you decide. Both the Kindle and Sony have good battery life, I believe the Kindle lasts longer but the Sony seems to go about 2 weeks without needing a charge.
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