Graniel is by far one of the reliable builders on the island. He just finished a house next to ours. He's a very honest man and cuts no corners. (I guess thats why he's been around for so long) Check out some of the houses on the south end too, talk with the owners to see what contractor they used, if they had problems, and if they would recommend using him again.
Make sure you have a written contract and all t's are crossed. Talk with as many home owners as possible and listen, listen, listen.