Which spec are you? V or R? V with 185/55/15 or R with 195/45/16?
What Jinster said is very true... If u want performance to maintain you need to stick back to the original size which i don't see any reason changing unless for cosmetic purpose only. But anyhow changing back same size won't make your car look a lot better unless you lowered the car. Let me share my experience with you. Personally i'm driving a Vios 1.5 MT with 175/65/14, steel caps. I change to 17" rims with 205/45/17 tyres. Pick up is slower, reaction slower but handling good. Very stable and feel heavy on road. But if going long distance is not nice. Very bumpy the ride. Good thing my car is manual... Going up Genting no problem, fast also.. Just that if suddenly slow down must need sometime to pick up back only.
I suggest you go up 1 size from your original rim will do. FC will definitely increase a bit. But just changing wheels won't affect a a lot unless you change also exhaust, air filter, etc....
Ask the shop which tyre size fit best for your car coz too thick tyres or wide will hit the fender when making u-turn.
Last but not least, once you start the MOD, you can't stop.