Looks fun
With regards to brakes, if you're doing 15 minutes of uninterrupted track driving like in your vid, then nothing will be that great on the standard WRX 4 pots. Rather than spending money trying pads/disc upgrades I'd just save up for a better brake setup. I wasted money on trying to get the 4 pots to work and whilst their performance can be improved, they'll still fade too quickly on track. Bite the bullet and go brembos or a bigger brake kit.