Hi, need help

1. Preferred brand : any
2. Budget : 2.5k
3. Usage : writing assignments, casual use and dota(only game i play)
4. Screen Size : FHD 14 or less, need to be lightweight and

I am looking at the asus zenbook ux310, the i3 variant, but if there is any other option available at the pricepoint that I'm overlooking pls do suggest. I'm also looking at upgradability, so if I can add an SSD and some more RAM in the future that would be great.