3SGTE is a nice little motor.
There was a good comparo posted somewhere.
Do you want a smaller wagon, smaller motor and more chuckable car? or do you want a more useable wagon, well known RB and the GT-Tourer wagon Stagea?
If you want a sports car, buy an Elise, if you want a car that can fit a fridge in the boot, yet drive like a large car, enjoy your stagea.
I would stick to the stagea simply for the RB, a well known motor, and something I have owned a few of.