Absolutely, your money and your choice of car. For me the 1.9JTD was the engine of choice (despite it being used in the majority of tractors seen in the fields) especially for long distance driving with a lot of weight in the car while maintaining good fuel consumption.
One (IMO) good thing about the 1.2 engine is availability of parts especially second hand.
Did you drive the Fiesta................did you drive the GP before signing on the dotted line?
Drove all 3 doors on the market, I've owned a few fiestas and it just felt the same plus price