I've always brought used cars for one reason. Depreciation.
The moment you buy a £15,000 (55 million shillings) brand new vehicle it loses £4,000 the moment you drive it off the forecourt and loose another £200 every month for the next 4 years.
My first car was a Vauxhall Corsa for £3695 (13 million shillings) it only had 19k on the clock, it was in excellent condition for a 4 year old car, previous owner was a midwife who was a non smoker and hardly used the car. I've had it for just over 6 years now and its served me well with it now having 96k on the clock. Although I no longer drive it, its still a reliable car.
As long as you know what to look out for in a second hand car i.e condition of the engine, suspension and bodywork then you should be fine.