pronunciation of a name

Hello! I've found this forum by chance and think it's very interesting.
For the moment being I am very bothered with one question which is the following:
How to pronounce the name "Michelangelo" correctly? Could you please give me a transcription in IPA symbols?

/maɪkl̩ˈændʒələʊ/ or /mɪkl̩ˈændʒələʊ/ (RP)
/maɪkl̩ˈændʒloʊ/ or /mɪkl̩ˈændʒəloʊ/ (GA)

Thanks a lot!
That day I found a nice pronunciation dist. on the web and heard a proper sounding of this word, but there was no transcription given. Now I have it and, oh my, I see that the diphthong "əʊ" can actually be pronounced as "oʊ".
Where can I read more about GA?