The reality is u can't find a perfect vitz in 1300k. Old ones rattle too much..infact new ones also rattle, as vitz has this issue since 1kr-fe came into existence.
For proper vitz ..proper budget is over 1500k... getting a used JDM, and then again used in Pakistan..seems like opening door to a mess.. that's my point...others may disagree. Wagon R will alteast be new with warranty...and suzuki K series is much smoother to drive than Vitz 3 cylinder. But Vitz has looks and stability which Wagon R lacks.
If u can find some 1.3 vitz, then vitz all the way..but budget will remain a constraint.