My ultimate plan is to have a full Subaru household consisting of a BRZ, WRX (STi or not), and a Crosstrek. I'm almost 2/3 of the way there with myself purchasing a BRZ very soon and my other half already having a Crosstrek. The BRZ will be the fun/backroads/track/auto-x car, while the WRX will be the practical around town car suitable for children.
While I do agree with @
JoeC and @
DarkPira7e, some key things to consider is what you want to do with this car, what is your budget, and what you're willing to do to maintain it. On the used market there's a bunch of good options around the price of a new BRZ but again it comes down to what you want to get out of the car.