here's some info of the different destinations...

BALI
http://wikitravel.org/en/Bali

BINTAN
-Bintan Resorts (the 'high-class' part of Bintan which essentially an unofficial Singapore colony in Indonesia...)
http://wikitravel.org/en/Bintan_Resorts
-Bintan (the real side of Bintan... could be pretty interesting to explore...)
http://wikitravel.org/en/Bintan

Phuket
http://wikitravel.org/en/Phuket

Both bali and phuket sound pleasant.. bintan sounds a bit dangerous (for the not so high class side) but very interesting..lol

anyway, it's not the destination that matters but the company so.. i'm sure we'll all have a good time no matter where we go :)