Suggestion regarding purchase of smart Phone within 25K

Hello,
I am a bit confused regarding purchasing a good phone.
I want to know which Android mobile will be best to buy. I just need perfect working with no issue.
My budget is from 20000 to 25000 Rupees.
It should include functions like:
- Have minimum screen size of 5.5”.
- Have minimum of 2GB RAM, 16GB internal memory. [if possible with expandable memory]
- Have minimum Octa Core processor [at least have or more 1.5GHz]
- Camera should have minimum of 13 mega pixel (back) and at least 5 mega pixel (front)
- Full HD with display resolution 1920X1080. [with a good resolution for video recording also]
-Smart looking and good battery life.
- Perfect Touch screen with high resolution and some like scratch resistant or protection to screen [may be gorilla class- version 3 or 4]
I have short listed my own 3 choices. Please compare and suggest.
Possible negative point (in my openion)
1. Samsung Galaxy A7 [ whether battery back-up will be a problem]
2. HTC Desire S826 [ Non-metallic body & display is not Super amoled type]
3. Gionee Elfie S7 [screen size a bit smaller – 5.2” & no expandable memory & after
sales service]
Regards