Romy,
Not too wild a guess. I had refrained from pronouncing until I could check it out further, but I would say that you are right on this. An aside: There is now a growing tendency to consider the larger race shelleyi as a separate species ranging on Palawan and Balabac and calling it Aethopyga shelleyi (monotypic)- Lovely Sunbird. Following this view, this bird, from Luzon, would be the split species Aethopyga bella minuta - Handsome Sunbird.
My wild guess - Lovely Sunbird (Aethopyga shelleyi), a Philippine endemic, probably a male of the minuta subspecies. I invite correction on this, please.