its an 07 STi that's still under warranty and drives well... f*ck the extended warranty, take it to an independent mechanic and have an inspection done. You can also meet up with someone on here who has a lot of Subie experience.
If you still love the car, buy it -- you'll only grow to love it more (as anyone on here will tell you). If you're happy with an "out-of-the-box" 07 STi (sans-suspension), wait until you feel a slightly tuned (stage 1 or 2) STi. As for the limited... meh, I'd take a regular STi almost any day.
Feel free to drive it down to Sarasota and I'll take a look at it for you.