Hi Steve,
Visa aside, I really think that you should go to the Philippines and meet her family, relatives, friends etc. At least once! This is not to do with VISA, but to be sure that you are making the right decision and to make sure that there are no hidden secrets.
For VISA, evidence that you have met is sufficient. This is for the embassy mainly to ensure that its not an arranged/force/convenience marriage.
Best Wishes,