On the back, most of the punishment comes from TC rather than braking. So anything really.
The stuff Brembo make for Omegas are the same shit made of cheese that all the pattern ones are. I've tried a lot of them, including Mintex (and Apec Doctor G

), and they are utter shite, and invariably ended up going back to GM anyway. So the cheap stuff just ends up costing more.
I'd learnt my lesson too many times with Omega brakes, so now I only buy GM brake parts for the Omega. And I hate to see people waste money on the same mistakes I've wasted mine on, so forgive my passion over it. I can see for the tunnies and Webbys of this world, a chocolate disc might last just long enough without distorting for the inner edge rust to kill it. But for most of us, a 1.8t reasonably powerful car on small discs....
I should point out I work in MK, which if you don't drive like the locals does give the brakes a good workout.