i agree with Fred, it is still cheap to live in the philippines compared here. The important thing is finding a good healthcare because even if you're 100 percent in good health, it's best to be prepared. Because hospitals can be pricey especially private ones. Renting a place can cost a bit depending where you guys want to live, i remember my parents rented a house in Baguio for 15k a month not including water/electricity bills. My advice is to have a look around the area you guys want to live, think about the surroundings, accessibility, etc. and buy land to build your own dream house that's what my parents did..
oh also if you do have you're own place in the philippines 30k for two would be enough for food, water/electric bills, internet, cooking gas.. etc.

good luck