Your lifestyle is going to play a big role in average costs. Do you like to go out to dinner often? Do you like to go to social events? Are you a home body? Do you use air-conditioning 24/7, do you need very high internet speeds? Do you like to cook and eat local food (chicken, rice and beans) or are you a gourmet chef?
You should be able to comfortably live within a budget of $1,500 USD per month excluding rent and depending on your lifestyle you can adjust that up or down.