Looking like a great purchase. I love how you've got the time without a Subaru all tracked hahaha! I could afford to cut down on at least one maybe, but somehow I feel I'd be just the same counting the days and missing them far too much if I got right out of them.
I really like the Q300 with the Invidia catless DP on my 04 Wagon (with the JDM Swap), it doesn't drone too much on that set-up. Also, I haven't got around to doing headers yet, which will change things a bit.
I have heard the Q300 on a couple GR hatches that where noticeably louder than mine, maybe they had headers. The catted DP you're running will combat a bit of excess noise in comparison.
For a daily I'm really glad I picked up that Maddad whisper back for my Forester. It's very subtle with no drone when cruising, but also satisfy's just right when pulling harder. It growls pretty good. This has been the best exhaust I've experienced on all of my Subaru's and different changes to each, especially for the highway.
Overall wagon's and hatches are typically more prone to producing unwanted drone with several exhausts, I'm sure you already know that though.