Want to buy an Android phone between 5k – 7k

I want to buy an Android phone with good features and specification, specifically big screen with good touch. And fulfill my need to surf net at its best to watch videos and play games. I am very much confused between Samsung and Micromax. How is Micromax Ninja series (like A57 and A87)?

I can increase my budget to 9k if there is a best option available.