in Jamaica I guess you have a different set of issues to consider than someone in the UK.

if you're keeping the engine / turbo standard its prob cheapest to buy a new harness and sensors etc. however, if you're wanting to tune it there may be no-one in Jamaica who has knowledge or ability with the stock ecu so aftermarket may be best. in that case, decide who is going to tune it and go with thier recomendations for which ecu to use