As per your requirements I would suggest you to get your hands on a brand new sunny.
Here is a little review of the mentioned car. I have a sunny with me since 2007 and I have completed almost 110k kms without changing anything except oils,fluids,filters. The car has a very solid body,it has good looks aswell (some people may disagree). The car is stable on high speeds,has good brakes,nice comfortable cabin,mileage of approx 14km/l in city and around 16+km/l on highways,the ac is chilling and a better built quality than city or corolla!
Parts availability is not an issue. Genuine oil filter costs 750/- and Air Filter for 1550/-.Brake pads for around 5k and brake shoe for 4k. On the other hand,genuine body parts cost the same as that of corolla or city. There are taiwanese body parts available in the market which may cost 50% less then the genuine ones.
The resale of Nissan Sunny is low all over Pakistan.There are only two options while buying a used sunny. 1) Extremely well maintained. 2) In very bad condition.
Well maintained cars can fetch good money even after using them for 4~5 years,so if you are buying a sunny,make sure you keep it mint.You wont have a problem in selling your car ..