It depends on your goal and self-confidence.
SGU, AUC, Saba, and Ross will land you competitive residencies.
Going to a $14k tuition/year Caribbean med school such as AISM in Guyana will save you a ton of money. However, you might have difficulties landing a clinical rotation in the US (always talk to past graduates and current students before making a decision).
If at all possible, and within redemption, shape up your app for a US MD/DO school before considering the warmth of the islands...