Suggest laptop for gaming to play at medium settings.ASAP

These are some of my options...Which one should i buy ?

Dell inspiron 15R (3rd gen core i5 + 7670M)

HP Pavilion G6-2016tx(3rd gen core i5 + 7670M)

Asus k53SM (2nd core i5 + 630M)

My budget is for Asus but if the other 2 are much better than Asus then i can add some more money ( need to think   )to go for it.

And I really want to know about the screen quality and battery backup of these 3 models and the best among them.

If there is any other laptop is better than these at this range please suggest..