i am having 2010 vitz from last one year and also have driven new shape passo, though both have same engine but somehow vitz seems slightly underpower in summer with ac on within city compare to passo so in summer i add about 20% hioctain in summer than perfect rest vitz is better than passo in looks, comfort, drive, handling etc
however in view of ur budget i would recomend fresh import new shape passo if u enhance ur budget atleast by 100k
pm me if u are intresting for self import can guide u aunthetic source