keep the stock wheels (rims) and get 185/70 R13 Yokohama A.drive best tyre for City, this tyre is a class above Yoko Aspec A 300 and much better than dunlop eco or bridgestone b70 or potenza ae714 available in this size. Yoko A.drive costs around Rs.4400 a piece on while dunlop eco and yoko aspec are around 3500-3700 a piece. Yokohama A.drive is a soft yet very grippy tyre it has got wet as well as dry grip. Yoko Aspec is a soft tyre as well but not good when it comes to handling/grip and gets very hard as it ages same goes for dunlop eco as well.
If you are going to change the wheels (rims) to 14" then the tyre size should be either 185/65 R14 or 195/60 R14 and i would suggest go for Yokohama C.drive its a better version of Yoko A.drive.
If you are going for 15" wheels then the tyre size should be 195/55 R15 or 185/60 R15 in this size yokohama S.drive or Bridgestone potenza GIII (very hard to find these days) are the best options but I would prefer S.drive over GIII myself.