Just got home from a trip to Maui, had a great time but like you I wasn't initially sure where to stay. It was a trip planned around my wife's 50th, best friends wife's 50th, best friends 55th and another couple's 25 anniversary. We didn't really care what island we stayed on but had some very specific requirements ie; water front rooms next to each other, kitchens, moped rentals close by, good area for going on walks, snorkel beachs close by etc. I contacted Kelvin (AlohaGT), he was a big help steering us in the right direction and eventually settled on Maui at one of his Astin resorts north of Lahaina. His help didn't end there as he also had our rooms upgraded, left us gift baskets and the staff treated us like we were special. A fantastic trip to say the least, IMO you couldn't go wrong contacting either him or Hilo Dave :thumbsup
As for the Bahama's, the wife and I have had the extraordinary fortune to cruise them the last 2 winters as a guest on Floridaochris new yacht. We did the Exumas in '11 and the Abacos '12 and both were fantastic, however if I had to pick one it would be the Exumas due to the sheer beauty of the water and many different options of the type of resorts/hotels and condos to stay at.
Good luck and have fun!