Just stick with some standard disks and pads. For what breaking the rear does, there’s no point going all out. Spend the money on the front or on some braided lines.
The one I have has two small cracks which need to be repaired. The cracks don't affect the performance, but after so many heat cycles the crack may spread and ruin the manifold.
Stick with drums, they only do 12-15% of the braking anyway. If well adjusted they'll outperform discs. Not to mention you'll have a working handbrake.