Bro, 185 tyres have to be installed by hook or by crook on Pakistani road. 175 tyres are default tyres for Japanese roads where speed breaker height all across is half an inch or so not so like half a foot in Pakistan:). So car would certainly bang on the roads (when loaded) due to low height of it.
Secondly, even 185 tyres wont serve the purpose if the car is not lifted from back a bit but 195 tyres will lift the car but will stuck in the body and for that also car needs to be lifted likewise. If you lift body on 175 tyres, the extra open gap between body and tyres will look odd . Although the difference between the two is only 10 cms but believe me, it makes a whole lot of difference in terms of overall dynamics of the car.
Moreover, the advantage of 185 over 195 is overall better areo dynamics as well as efficient fuel economy , so its a win win situation. I am sharing my own experience as I had 195 installed at the time of purchase , got it changed to 185 and drive is much more smoother as well as; is the Average. Your call obviously...