Tried Napa, broke a week after at an event.
Tried Discount, broke in two days of spirited driving.
Tried Raxles, beefy as hell but set up vibration issues in the car
Went back to OEM, no problems

Driveshaft shop makes some pretty decent axles, and even has a set specifically for road racing/auto-x that I have heard good things about. When my current set finally decide to give up, I'll probably go that route.