kzap, Like Pierre&Cédric mentions you've missed out on some of the best contenders. FS seem to be the one generally considered to be the best while Raffles undisputably has the most character.
Out of the ones you've mentioned Fullerton is the one that this forum (though I don't claim to have Kagehitokiri's Google-fu) considers the best. The new Golden Circle program at Shangri-La has elites up in arms currently. This doesn't say anything about the hotel itself however.