What’s the best choice?

CarlCarl has his own landscaping business and plans to get a pick-up truck. He’s been considering a brand new one, but the same dealer has a used one in good condition with low miles. He has enough cash to buy the used one, although that might mean paying some of his bills late for a few months and a delay in buying new plants. Three years from now, he’d like to sell the truck to his little brother, who’ll be turning 16.
Given his situation, which one these three possible options do you think is best for him?