When you say budget is around 300k. Eto na ba talaga o pwedeng pang down tapos monthly nalang? Kasi you can get a brand new car na with that. Diesel maganda FC pero siyempre pms cost is a bit higher.
Kung sticking to petrol, get one of those 1.0 to 1.5 na mga displacements. Pero nakakatakot din kung second hand na small car... I rarely see super well maintained na small car eh