Glad to hear the excitement! It's definitely a fun vehicle.
I'd recommend going with an aftermarket hitch. The Subaru one is ~$450 before labor to install (it replaces the rear bumper, as I understand) and only comes in 1 1/4". The Curt XV hitch can be had for ~$150 and Torklift offers one that stays hidden
I just can't see paying $450+ for a 1 1/4" hitch when there are better options available.
Anyway, enjoy your XV!
As an aside: how long have you been a runner? I've just recently started. Doing a 13.1 at the end of this month and hoping to do a 26.2 in October.