Budget - Rs 70-80k, can go slightly higher if needed
Size - 13-14'' screen, neither too big, nor too small
Weight - not more then 1.5 Kg
Screen resolution - 1920 x 1080p (Full HD)
Battery back up - minimum 5-7hrs, the more the better
Brands -
a. Like: HP, Lenovo
b. Dislike: Dell, Sony
but...