Is a buck regulator the best option for my needs?
This will be used to power an MCU, some modules, LEDs cosuming about
  200mA max


Linear technology parts are not cheap (I haven't checked on this part) but it has a low parts count. The picture below directly converts to 3V3 but, by using resistors connected to Vfb, higher regulation voltages can be obtained: -







GOALPOST CHANGE: 


  1.5A isn't mandatory, but I would rather not go down to 0.5A, just in case, so 1A is a good compromise.






Or, plug your numbers into the LT parametric engine here. I chose to tick the radio box marked "synchronous" because then you don't need to worry about the flyback diode.