> Does anyone know which SAM is the hardware wise most stable and well rounded?
> I got the impression that it's one of the 440's, but I would like to get that confirmed.

I remember having read about stability issues with the 800 MHz version of the Sam440ep-flex when running CPU-intense tasks for long, which I think was ascribed to the 20% overclocking of the CPU (CPU manufacturer rates it at 667 MHz max). For the 733 MHz (10% overclocked) version I don't remember reading about such issues.