[LongaDonga]

Personally there Gor, i prefer 'Phanrit' as that is the traditional transliteration.

As Mat pointed out though since you are a bit of an international name you could try the more modern version of 'Panrit'.
Over the years Phattaya has changed to Pattaya and Khorat to Korat etc... just to make it easier for the foreigners to read it but the likes of Phuket to Puket and Thailand to Tailand! well perpas they will never be changed.

Go for Panrit i'd say, it suits your international readers better, Phanrit reads a bit like ones dad's name.