I'm happy with it as-is for now. I've never driven a turbo so it's fantastic to me!

Accessport is first thing I do though, I know all about them.
Edit: NC, I'm going to be heading your way soon to watch some kart racing, we'll have to meet up so you can give her a thrashing.
Congratulations on the new purchase!
If the car has RE92s; give them to someone you don't like. Now! The Deathtenza wears poorly, wallows, and the breakaway is very erratic earning them that name. You can often find RE070s from an STi for a song from those who upgrade.
On the other hand, the chassis is very safe. I walked away from a wreck in a 2005 that occurred at around 105mph. Tyre failed, the rear walked into a tree in the left rear door blowing the rear window out and sending the LR wheel/strut assembly a few hundred feet up into the woods. The LR caliper was never found, along with the LR axle, but all of doors were openable except the LR, and the driver's window which was partway down was never broken. Side airbags are wonderful. The only injuries I received was a cut in the webbing between my fingers from the rear window glass getting everywhere and scratched my hand as I grabbed for the shifter, and a hematoma in my left hip from the seat bolster. The B pillars are laminated stamped steel surrounding a small 'rollbar' of sorts.
If I am recalling correctly 2008 has a catless uppipe which is wonderful as the older models had a tendancy for the cat to break up and destroy the turbine. If you plan for increased boost, I would monitor exhaust temperatures. Specifically, monitor cylinder #4, as it is the last on both the coolant cycle and fuel line giving it a tendancy to run lean and get hotter than the rest. If an EJ motor goes, it's *almost* always number four.
The only downside is that the cars are a bit soft, making them rather pushy at the limit. You can mediate some of this cheaply with crash bolts up front to gain some camber, and a set of sway bars. Also, the drivetrain is mounted in soft rubber, and I remember a hurried 1-2 shift would often feel like the rear differential wanted to come up through the backseat. Hopefully they haven't changed the oil filter location, as it was nice to be able to change oil without jacking the car up at all. Subaru even put trap doors in the splash shield so I didn't have to pull the plastic apart each time.
Oh, and plan on replacing the clutch between 100-125K km. In rare cases they make it close to 200k km, but that is almost invariably in cars that spend all of their time on the motorway. They are cake to change, though.