Congratulations I also bought a white city MT in March 2014, just missed the reduced price with a margin of 10 days so have to pay 15.60 for the same car, so here are the changes I have done with my city...
Changed the tyres, got 12000 for the old tyres when I sold them before 1000 km drive, installed Continental 185/65/R15 tyres from Asad Tyres Rwp, very happy with Continental tyres and I would suggest you to go for them, also got new Alloys (New tryre cost me around 32,800 and Rims around 20,000, sold the stock rims at Rs. 6000, Installed the Axis Navigation System with 3d maps and night vision cam at Rs. 26,000 (Though you can find cheaper ones around 20,000 but they are not worth it, sold the old alpine cd player at 5,000) Installed pioneer speakers at back doors as well. Also Installed the Aspire style leather seat covers from Saddar...
and yes one more change, got the full chrome grill from Lahore and changed the stock grill (kept the old grill) car's look has changed a lot with this full chrome grill and so far three different people have asked me about the price of that grill and from where I got it