185-65-14 would be the best size for ur vitz. As with stock 165-70-14 profile the car hits with the speed brakers. The recommended size will solve that problem.
I would recommend you install, one of my favorite, Continental CC6 for comfortable, very low noise, good grip and durable tyre. It goes well with all type of roads.
my 2nd recommendation will be Bridgestone ecopia (less comfortable as compared to CC6)
3rd yokohama as for rough road its wear factor is a bit high and more prone to damages. Overall good in comfort and drive.
I always get my tyres from Discount tyres in bluearea. Very humble and honest dealer. Good prices as well. Related to tyres, i haven't met anyone with such knowledge. Im trust them completely with my and my friends tyres. 0333-0123124 Talha. Contact him.