Welcome to the family. So glad to see the excitement! Subaru Legacy owners are definitely a a different breed. You chose a great color and it looks really clean!
Remember that all mods are your own personal preference. I personally like the simple tasteful mods and nothing too flashy. Afterall, it is your car and you want to get a little more fun out. It's up to you on how you want that fun!
One thing I would do right away is just get under the hood and get a feel for whats there. Maybe replace the air filter with a K&N drop in for now. Clean the mass air flow sensor. Small things like that.
Some of the 6th gen owners showed me a pretty affordable drop in JDM grill for about $400.
I don't follow the 6th gens too much so I can't suggest much else. I don't know what aftermarket parts are out there, especially since it's such a new car.