The Ghauri is a one stage ballistic missile missile with a throw weight of around 700kg and range of approx. 1,300 km.
In addition to the Ghauri, Pakistan should develop a two stage Ballistic missile which would have a payload of around 2,500 kg and range of around 2,000 km. Such a missile would be logical extension to the Ghauri and in addition would allow Pakistan to deploy this new missile deep within Pakistan and still be able to hit every part of India with a thermonuclear warhead. (Hydrogen bomb)
Secondly such a missile would increase Pakistan's ability to launch satellites. Satellites could either be launched on this new missile or this missile could be used to improve Pakistan's expertise to design a dedicated space launch vehicle.