I don't think 3 serie base pricing is cheaper then X1. (Proof me wrong)
For a fully loaded X1 you got the cheapest 5 however. (Back in the day's anyway, every year they make the gaps bigger.)
In Europe we got the 114i and a Mini is a Beemer as well.
Edit:
Oh Oh
http://www.vroom.be/nl/prijs-nieuwe-auto/bmw