Go with a built and balanced 2.5l. Back when I did my swap there weren't too many options available for built motors and swaps and the price of JDM motors was cheaper. If you have to worry about emissions testing it will be much less of a headache going with a 2.5. The V7 motor is great, but there are much better options out there and a nicely balanced 2.5 will be just as smooth as an ej207 if not smoother. A nice option would be the Gruppe-s 2.1l high rev block that is a built ej207. That's what I will do if I ever blow my 207 up.