It also depends on what your budget is, what you prefer and what area it should be close to (i.e. subdivision, open area, etc.). Take note also that flooding in some areas due to Ondoy was due to extraordinary circumstances.

Paranaque was also mostly spared from Ondoy from what i know. In San Juan, areas near the river were hit.

When considering an area/property, just googlemaps it to see the terrain and any nearby creeks/rivers; when you visit it, take note of the terrain and where the water will flow to. Pag natyempo that there's strong rain and you're in the vicinity, go to the area so you can also observe water buildup (i've done this before and it was quite helpful).