With your budget of 500~700k Pesos, these are your choices kung brand new:

Hatchback
Chevrolet Aveo (545~585k)
Hyundai Matrix (625~680k)

Sedan
Chevrolet Optra (635~675k)
Ford Lynx (535~765k)
Toyota Vios (528~628k)
Honda City (499~619k)

If you want larger cars, look for a second-hand.