A Nissan Sunny 1985 is a good car. Parts are available but they cost rather more than any local car also since the car is more than 30 years old it is very difficult to get a good clean rust free one. Majority available are kept with little care and are mostly filled up with polygate.
No offense but if you want a trouble free car on a tight budget and which give lesser running costs buy yourself a clean mehran. That thing is damn reliable and stupily cheap to maintain