What is Mi3? can you tell me about the new HTC desire 616 which has been launched few days back? Its overall nice but not upgradable to kitkat
Mi3 is a phone by Xiaomi, this company has just entered the Indian market via the online store flipkart, the 2nd lot for the phone was sold out in 5 seconds.
With a 441 ppi full hd display, Qualcomm snapdragon 800 processor and gorilla glass 3 as it's specs it is giving Samsung and Lg's flagship a hard time mostly due to it's damn cheap price of 14000Rs./234 $.
You will have to register yourself to be a part of the next sales, for more information please check flipkart.
Regarding desire 616 I recommend not to even consider it, leaving all specs apart just look at the Internal Memory provided, only 4gb out of which only 2 gb would be available to you for app installation.
I would recommend you to go for Xiaomi Mi3 because of it's flagship line specifications and value for money or the Moto G which is currently available at a discounted price of 12000Rs./ 200$ for the 16 gb version, the rates have been reduced due to heavy competition offered by Xiaomi Mi3, I think.
Rest do your own research, check youtube vidoes and reviews.