i used tim and tina at investinbelize.com. they are amazing people that held my hand every single step of the way. they went from being my realtors to being dear dear friends who continue to be a positive influence in my life. i simply cannot say enough about them. their number is 501-226-4000 or go to the above website.
now, having said that, there are many amazing people on this island who also sell real estate. lots of real estate companies have wonderful people and great reputations.
like buying in the states, you need to have a relationship of trust with your realtor. talk to some of them, and pick the one that you like.