i don't live there, i'm just a tourist. but based on what you say you're looking for, if i were you, i'd have to agree with jzb - north of the cut by at least 2 miles, 3 miles/+ south of town, or the west side.

at that point, you'd have to think of how far from town or how remote you want to be. even tho you're familiar with belize and cc, you really do have to go and spend a week or two on AC to get the lay and feel of the land. i think each area possesses unique charms.

and of course, yes, use a reputable realtor - there are several well-recommended ones available there.