im going for the 13a residency visa , this is if you are married to her, a lot of work to get it but its a cheaper option than renewing tourist visa every few months, and cheaper than retirement option with regard to how much you need stuck in an account,
of course if you marry, there is the balakbayan privilege which gives you 1 year visa free,
there are many threads and post you can read up on, which will give a lot to think about