Some of the other features I liked with the Limited was the auto on/off headlights, power drivers seat (which I love) and the defrost in the mirrors and windshield wipers (not in base model). The power seat is great for when you put on different kinds of shoes and you only need the smallest adjustments. Its harder to get right with the manual adjuster.
As far as WRX vs Sti.... for me it was all about the fuel economy. I spent nearly as much for my Limited WRX (with technology package which I think is def worth the $2500) as the base model Sti. But an Sti is only going to get 22-23 mpg while Im getting 29-30 mpg on the way to and from work everyday. You cant beat that... especially for a car that does 0-60 in 5.5 seconds. So it was a no-brainer for me.