Papanui is a popular area in Christchurch which allows its residents easy access to facillities such as restaurants, bars and shops.
Sumner and Ferrymead are also very popular areas with young people, especially surfers and those that enjoy being away from the city centre. It also has its fair share of bars and clubs.
Take a look at the Accommodation in Christchurch page for more information.
Best of luck with the move.