What I can tell you is that buy frm Alta. Im also buying through him. Just finalizing the deal.
Call him on 0333-2135567. He is in Karachi and can get the car to Islamabad safely. Reasons to contact him are many incl. best price, cleanest cars and good dealer attitude.
When the car is here, then take it to AlMubarik CNG and get Lamda Control CNG Kit installed. Prices of Vitz in Islamabad are Skyrocketing and its better to buy frm KHI !
This is a pic of Storm bhai's Vitz ! Just to show u a 2003 Vitz. ( I think its 2003) BTW this was also bought thru Alta.