OP I think you'll find the price of rent in the PI to be more expensive than Thailand, especially around the Makati/Taguig/BGC areas.
I rented a 1br studio near University of Mindanao (Davao City) for my Ex-GF & it was 25,000 PHP (Approx 16,000 THB), a studio in a ladies only boarding place near GMall was 20,000 (approx 14,000 THB).
I do prefer the Southern Philippine Islands (Visayas) though, if I were to move there it would probably be Davao, Cebu or Bahol, Palawan is a tourist spot so would expect it to be more expensive. If I were on your budget, I'd probably choose Tagum (about 1.5 hrs north of Davao City, I used to have a house about 20 minutes further up in Kapalong & it was the closest "Town") or somewhere like Cagayan De Oro which I've heard is popular with Expats.
I wouldn't worry about the lack of "Visible" P4P anywhere in Philipines, it's easy enough to find a willing partner whether it's paid for or longerterm (& so more expensive ???? )
Still say Pattaya is cheaper than anywhere but the boonies in Philippines, Udon Thani even more so...