Hello, if you really like the 1.4 you should get it although I think that money for a 5 year old car may be pushing it. Not to worry about long lasting car though, because the 1.4 is a good long lasting engine. It will have the old suspension though, so you probably would need to change all the suspension to have a good handling car with the 1.4.
It has basically the same mileage as my 1.4 and the engine is singing very nicely so I guess the engine would be the least of your worries?
I have the 140 km/g (g/km? I am no good with Eurobureaucracy) but I know I have the new Euro 5 one without the SS so 140 it is.
Unless you do 1000000 miles the difference in money for petrol of the 1.4 and 1.2 is not exactly the end of the world.