@Vista: Best upgrade for you would be 185/70/R14 on same 14inch rims as stock. Dont go for alloys as it is prone to bend and replacing/repairing is tough and costly. Its always better to stick to stock profiles for better dynamics. If you need more meaty tires, only then go for 195/60/R15. This will give good grip/handling/cornering abilities. Else 185/70/R14 should suffice. If the car is new, keep it for 185/70/R14. Use it to your likings and understand the dynamics. Later can take a call on moving to 195/60/R15.