When I was shopping for an ST and realized that I was getting into Mustang price territory, I started looking at the Mustangs. I liked the Ecoboost, but by the time you get the Ecoboost and the performance package, you are in GT price territory so then I started thinking maybe GT.
The whole Mustang idea was put to rest when I compared them side by side at the dealership. The Mustang is a BIG car outside, but a small car inside. The Focus is the other way around. Knowing that I regularly go camping with my son and his Boy Scout troop, I knew I would be better off with the four doors, hatch back, and five passenger seating of the ST. Also, Mustangs are everywhere. I know it doesn't matter, but I didn't want the same car as a bazillion other people. None of my friends had ever even heard of the ST. I pulled up to my buddy's house and he said, "What the hell is that?!" My brother said, "Uh...I don't know...it looks kind of Fast & Furiousy". Some of the neighbors love it, some hate it (because of the color, Tangerine Scream). The delivery guy at work (black senior citizen) said, I got to look at your little car, and it's real nice; but isn't that the kind of car that the "hip hoppers" drive?
Oh, and the Mustang was not available in Tangerine Scream. I have no regrets.