That makes sense then.
Those Brembo's do look a tempting price. Two things though, given the oems are sold as being lighter, that may affect the drive. On the other hand, the oems are not pairs, they are all identical meaning that on one side the vents are the wrong way round so that side won't be as effective at cooling. In practise on road perhaps that won't matter. I'd still be tempted to get the oems though as that is just how I prefer doing things. I'd certainly be interested in how you find any non-oem parts if that is what you decide on.
One other point though, do the discs actually need replacing? Mine are on 50k and wear hasn't been mentioned yet on a service.