Went to visit this shop called "Chuan Lee Hin Tyres" and the guys there recommend me to go for the 16" rims.
As it will increase fuel consumption, decided not to do that and go for the 15" instead. The tyres I choose is Bridgestone Adrenalin Potenza RE001. This is a performance tyres and I am satisfy with the performance, except that the price is quite steep. but for the sake of safety, I don't mind paying extra cash.
This is the the enhanced look of my city!