Newer turbo I-4's in the FR-S's price range are typically not built to handle big power (ahem.. 1st and 2nd gen Mazdaspeed3s, which would likely walk all over this thing from a roll stock for stock). The small factory turbos cant handle holding high boost at high RPMs and turn a lot of that boost into waste heat or just simple fail.
Of course, you can upgrade them but it takes a decent amount of money to do it right and keep it running good for the long haul, money that you wont get back once invested in the car. I like starting with significant performance (370Z) and a more mature crowd plus then modding a bit to make it even faster.
Plus, I dont like the looks of them, a bit too "high school" for me, although I probably would have loved one back in high school.
If I had extra money, it would go to an old 240Z or 280Z to stay with the lineage and my money would go into restoring it and adding a nice RB motor to it.