first off, thought very puffy and fairly hungry and extremely happy Favia sp. The oulo, iso (maybe not so much) and symphyllia families (basically the three coolest ones; depends if u like wellso/trachy or not!) crossed my mind, but only barely, if ever, seen pics of the bennettae, and never in person. kinda rings a photo-bell in my head, but not sure. anyway, GORGEOUS piece, and if u want awesome comparisons, im sure u already tried, go to tropicarium's page with it on there (i think i may have jus done a no-no by mentionin a vendor like that, not sure, im ONLY sayin it to have him compare pics, and im not linkin the pic or site, but my bad if it's not allowed)
good luck, and have fun feedin it cuz there are some awesome pics of em eatin floatin online!!