Shaheel thanks for the advice bro.. I went to honda to pick my car documents. I spoke to a mechanic there, he cautioned me not to go for 16inch.. He is said, it will cause extra load on the suspension and engine.. So am planning to simply get 15inch but the tire must be 195/R15. I will be travelling to karachi this week, I might search the market there, if i get some cool rims then I'll buy from there.. I plan to buy branded light weight rims..
Waleed: I luv your markx rims.. but its good you are changing them, they look a bit old fashioned..but on markx, they still look as recently launched.. your bro must be a big boy driving markx.. 
Best of luck with the purchase...