Don't want to sound like a biased owner, although I am really, but the real attraction of the Impreza is not just the power, but the handling and grip. Most Imprezas aren't really that quick in a straight line, but they sold in bucket loads and people love them because show it a back road and it'll give you an absolute whale of a time.
The Sport shares nearly all of the Turbo's chassis and handling components, so while its not quite as good, its still an absolute riot to drive quick. Some people who've owned both, rather than just looked at the specs on a website and gone "ZOMG! THATZ SLOW!", even claim the Sports more fun than the Turbo.
I freely admit that there was some 316itis going on when I bought it, and the fact its a Subaru did contribute strongly. But at the end of the day, I walk out the front door, see it parked on the drive and think "wow, thats gorgeous, and its all mine, and I cannot wait to drive it".
I don't think I'd get that with a Mondeo, or an Omega, or a 1.6 Focus, or anything else I considered. Whether they were faster or not, it'd just be a nice car. My Impreza is something special to me.