www.sulit.com.ph is a good website for having a look around. Once you arrive, take a bit of time on Google Earth, check out the MRT routes, work out where you want to be, visit the area and decide whether you want to live there.
I'm biased because I like Marikina, and think, within Manila its one of the better places to be. You need to get familiar with the subdivisions and major apartment blocks, and then you can decide better where you are looking and how much you should be paying.
