I'm looking for a Micra for my niece as her first car. Up to £2k to spend. Generally the more you spend the better the car you'll end up with but are there steps in the model's development that are really worthwhile looking for? For instance did the April 1998 facelift with its body & mechanical improvements make a real difference? Are they all prone to sill and crossmember corrosion or did Nissan address this during its life?