I have both this cell in last years Diwali the time when 1 gb ram where at the peak of the product cycle and 2gb ram cell where just to enter. I went to vijay sales to see the mobiles.And I found micromax Canvas Nitro 310 at 12500 with octa core processor, 13 mp camera, 5 mp front camera, with 8gb Internal Memory and expandable of 32 gb. This mobile comes with the 2500 mah battery which last atleast a day with all the application running in back ground like watsapp, face book, gmail.
I would recommend all of them to buy this if you are looking to buy there is a huge diff of around 2500 if you go for the same in Samsung or sony it would cost you 12000 to 15000 but this product comes in just 9500(todays road.)